The balanced reaction equation for this redox reaction looks like this:
H₂S(aq) + Cl₂(g) → S(s) + 2HCl(aq)
First, we write what we know about the reaction:
Hydrogen sulfide (H₂S) that is dissolved in the wastewater (so the physical state is (aq)) is reacting with gaseous chlorine (so Cl₂(g)) to form sulfur (which is solid at room temperature, and does not dissolve in water, so S(g)) and chloride ions (Cl⁻). To counter their negative charge, we add the hydrogen from H₂S to chlorides, which results in HCl, which is soluble in water, so the physical state is (aq):
H₂S(aq) + Cl₂(g) → S(s) + HCl(aq)
When we look at this equation we can see that it is not balanced, because we have 2 H atoms and 2 Cl atoms on the left, and only 1 of both on the right. The easiest way to rectify this is to add "2" in front of HCl, resulting in a balanced reaction equation:
H₂S(aq) + Cl₂(g) → S(s) + 2HCl(aq)
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calculate the molar concentration of the solution formed when 8g of sodiumhydroxide is dissolved in 1dm³of water
Answer:
wow I can't believe you. your cheating I'm giving you a f on this. unless you tell me in front of the class that you cheated. I'm joking man but seriously I don't know
Which of these is a measure of the average kinetic energy of the molecules
of a material?
O Option 1
O temperature
O thermal energy
O bonding energy
The measure of average kinetic energy of molecules is called tempreture.
What is kinetic energy ?
kinetic energy is a form of energy that an particle has by reason of it's motion.
If we want to accelerate an object then we must apply a force .
The average of all kinetic energy the molecule assumed to be directly proportional to the absolute tempreture of the gas.
The Kelvin tempreture of a substance is directly proportional to the average kinetic energy of the particles of the substance.
This is the reason why measure of the average kinetic energy of the molecule of a material called tempreture.
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You have a solution that contains 100 ml of 1. 5 m potassium carbonate and another 100 ml solution that contains 1. 0 m fecl2 and 2. 0 m nabr. When you mix the two solutions together to form a precipitate. What is the precipitate and how much is formed assuming the insoluble product precipitates completely?.
Answer:
235
Explanation:
two chemicals a and b are combined to form a chemical c. the rate, or velocity, of the reaction is proportional to the product of the instantaneous amounts of a and b not converted to chemical c. initially, there are 100 grams of a and 50 grams of b, and for each gram of b, 2 grams of a is used. it is observed that 25 grams of c is formed in 7 minutes. how much is formed in 28 minutes? (round your answer to one decimal place.)
Answer:
A + B = C reaction decreases as time passes and the reactants get used up. r = -kAB during reaction A converts 2x while B converts x to form 3x of C let's say y = C y = 3x amount of reactants not converted yet , for A: 100 - 2x for B: 50 - x variatio
Explanation:
If the acetic acid being titrated here were replaced by hydrochloric acid, would the amount of base needed to reach the equivalence point change?.
yes, the equivalence point would change as acetic acid is a weak acid and dissociates partially but hydrochloric acid is a strong acid and dissociates completely.
Between equivalence and endpoint, what is the difference?Equivalence and endpoint differ primarily in that the former refers to the point at which a chemical reaction ends and the latter, to the time at which a system's color changes.
Define equivalence point.When enough titrant has been administered to entirely neutralize the analyte solution in a titration, this is known as the equivalence point. The titrant (standard solution) has a molecular weight that is equal to the moles of the solution with the unknown concentration.
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In a parallel circuit with identical light bulbs, which of these is true? A A battery is not the source of voltage. B There is only one resistor, such as a light bulb. C The circuit is left open so that current cannot flow. D Adding more identical light bulbs will not change their brightness.
In a parallel circuit with identical light bulbs, the statement D is true. D Adding more identical light bulbs will not change their brightness.
A parallel circuit has two or more paths for modern to waft through. Voltage is equal across everything of the parallel circuit. The sum of the currents thru each route is equal to the entire modern that flows from the supply.
A parallel circuit has one feature: to preserve the power flowing while one pathway is interrupted. A top instance is mild furnishings that use more than one mild bulb. when an unmarried bulb within the fixture goes the light fixture maintains to operate.
In a chain circuit, the modern-day thru every one of the additives is the same, and the voltage across the circuit is the sum of the voltages throughout every issue. In a parallel circuit, the voltage across every one of the components is equal, and the total cutting edge is the sum of the currents via each element.
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Which element does the "X" in
the isotope notation
represent?
14X
6
A. C
B. O
C. Si
D. N
The element whose isotope is represented as [tex]_{6}^{14}X[/tex] is carbon -14. The atomic number of carbon is 6 and the mass number for the given isotope is 14 amu.
What are isotopes?Isotopes are atoms of same element with different mass numbers. Isotopes slightly changes in chemical and physical properties between each other.
Almost elements in the periodic table are having isotopes. However not all of them are stable. Some of them for heavy metals are radioactive isotopes and are not stable.
The isotope is represented by showing mass number in top of the symbol and atomic number at the bottom. The atomic number 6 corresponds to carbon. Hence, option A is correct. Carbon -14 isotope is given here.
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How did the Bronsted-Lowry acid-base theory clarify what Svante Arrhenius was not able to explain in his theory of acids and bases regarding ammonia?
The Bronsted-Lowry acid-base theory clarifies what Svante Arrhenius were not able to explain in their theory of acids and bases regarding ammonia as -
Svante Arrhenius theory states that -
In order for a substance to release H⁺ or OH⁻ ions, it must contain that very ion. But, this does not explain the weak base ammonia NH₃.
In Bronsted-Lowry acid-base theory -
Acids are the proton donating group while bases are the proton accepting group.
Ammonia is a nitrogen and hydrogen inorganic compound. Ammonia is a gas which is colourles, it is strong, and has a pungent smell. Its chemical formula is NH₃.
Ammonia is a stable binary hydride. It is the most basic nitrogen hydride. It is a typical nitrogenous waste, specifically among aquatic organisms. It contributes to the nutritional requirements of terrestrial organisms. It acts as a forerunner to 45 percent of the food and fertilizers all over the world.
70% of ammonia with urea and di-ammonium phosphate, is used to create fertilizers. It is available in a variety of shapes and compositions. The pure ammonia is spread onto the ground.
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describe how you can use the periodic table to charge of an ion?
Explanation:
To find the ionic charge of an element you'll need to consult your Periodic Table. On the Periodic Table metals (found on the left of the table) will be positive. Non-metals (found on the right) will be negative.
does backing contains metallic and non-metallic elements? which ones are which?
8. In the lab, you are asked to prepare 150 mL of an 85 g/L solution and then use the original
solution to make 500 mL of a 50 g/L solution.
a) How much solute is needed to prepare the original solution? (Think: C = M/V)
b) How much of the original solution (mL) is needed to make the diluted solution?
For the original solution,
Concentration = 85g/L = 85g/1000ml
Required Volume = 150ml
(a)
Concentration = Mass/Volume
⇒ 85g/1000ml = Mass of the solute/150ml
⇒ Mass of the solute = 85 x 150/1000
⇒ Mass of the solute = 12.75 grams
Hence, 12.75 grams of the solute is required to prepare the original solution.
(b)
Now,
Concentration of the original solution = 85g/L = M1
Required concentration = 50g/L = M2
Final Volume = 500 ml = V2
Required Volume from the original solution = V1 =?
As we know,
M1V1 = M2V2
Hence,
85g/L x V1 = 500 ml x 50g/L
⇒ V1 = 500 X 50 / 85
⇒ V1 = 294.11 ml
Therefore, 294.11 ml of the original solution is required to make the diluted solution.
What is a Stock solution?A stock solution is a very potent mixture. These solutions are quite helpful since we may take a small amount of the stock solution and dilute it to the required concentration. These ready-to-use chemical reagents can be prepared quickly thanks to these stock solutions. It also aids in material conservation. As a result, just the amount of stock and solvent required for the dilution process is consumed when utilizing a stock solution to low-concentrated solution. Because we simply need to dilute the stock solution instead of preparing the solution using many reagents and complex procedures, it is also crucial to conserve storage space. Additionally, it enhances experiment accuracy.A chemical reagent is present in vast quantities as a stock solution. It has a uniform concentration. Examples of typical stock solutions in laboratories are sodium hydroxide and hydrochloric acid. These play a critical role in creating titration-related solution preparations.To learn more about the Stock solution, refer to:
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Read this excerpt from Chapter 1 of Wheels of Change by Sue Macy.
Some attribute the breakthrough to Ernest Michaux, a French carriage maker, though others credit Pierre Lallement, who worked for him. At any rate, the new velocipede was propelled by pedals and cranks attached directly to the axel of the front wheel, which was slightly larger than the wheel behind it. Forward progress could be stopped or slowed by pedaling backward. However, with iron tires and only an ineffective steel spring under the seat to absorb bumps in the road, this velocipede was a challenge to ride. It quickly earned the nickname "boneshaker."
Which signal word(s) from the excerpt suggest a change of direction?
some
at any rate
forward progress
however
The word "however" from the passage from Sue Macy's book Wheels of Change denotes a shift in strategy. As a result, Option D is the appropriate statement.
What does Wheels of Change's theme entail?
The narrative "Wheels of Change" has as its central message that you should no longer be frightened to speak up for yourself and other people. This was demonstrated as girls' racing gained popularity.
Cycling has gotten more violent, and males have developed a strong concern about girls getting their rights. The Springfield Bicycle Club was established in 1881. While giving back to the community, Wheels of Change empowers citizens, boosts self-esteem, AND offers worthwhile transitional work. For $13/hour, Wheels of Change offers temporary jobs to people staying at the Temporary Bridge Shelter program run by Alpha Project.
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estimate the pressure necessary to melt water at −10ºc if the molar volume of liquid water is 18.01 ml and the molar volume of ice is 19.64 ml. the molar entropy change for this process, 22.04 j/k, remains constant with temperature.
If the molar volumes of liquid water and ice are 18.01 ml and 19.64 ml, respectively, then 1334 atm of pressure is required to melt ice at 10 C. 22.04 J/K is the entropy change process.
The term "molar" relates to the mole, which is the unit of concentration molarity and the number of moles in a liter of a solution. The phrase most frequently refers to the molar concentration of a solute in a solution in chemistry. The mol/L or M units of molar concentration are used. Molar also describes many molecular quantities including molar mass, molar heat capacity, and molar volume.
The most popular unit of measurement for molal concentration or molarity is moles of solute per liter of solution. It is defined as the amount of solute material per unit volume of solution, or per unit volume available to the species, and is denoted by the lowercase letter.
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Given: 0.156M C2H4O260mL H2O4.17 pKaIn a NaOH and C2H4O2 titration
ANSWER
STEP-BY-STEP EXPLANATION
Complete each statement by writing the correct term or phrase from the list below
in the space provided.
abiotic factors
biotic factors
Interdependence
conformers
ecology
ecosystem
community
acclimation
1. Organisms that do not regulate their internal conditions to the environment are
habitat
herbivore
Osprey
2. An organism's change in response to a change in the organism's
environment
3. A(n)
aspects of its habitat, such as the soil, water, and weather.
4. The living organisms in a habitat are called
consists of a community and all the physical
5. 98% of this birds diet is fish
6. The dependence of every organism on its connections with other living and
nonliving parts of its environment
7. The many different species that live together in a habitat are called a(n)
8. The study of the interactions of living organisms with one another and with
their environment is called
9. Organisms that eat producers are called
10. The physical aspects of a habitat are called
11. The place where a particular population of a species lives is called its
Each statment correct phrase is completed.
1- Conformers are organisms that do not regulate their internal condition to the environment that habitat.
2- A change is an organisms surrounding that causes the organisms to react is called a stimulus.
3- soil,water and weather are abiotic factors of habitat.
4-An ecosystem consist of all the living organisms in an area.
6- ecology is the study of how organisms interact with one another and with their physical environment.
7-The many different species live together in a habitat are called a community.
8-ecology is the study of organisms and how they interact with the environment around them.
9-organisms that eat producers are called primary consumer.
10-The physical aspects of habitat are called abiotic factors.
11-A place where paticular population of species lives is called it's habitat.
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Which of the following examples is evidence of a physical change?
A: A person inhales oxygen and exhales carbon dioxide and water.
B:Ice cream melts in a bowl.
C:A silver spoon tarnishes over time.
D:An electrical current splits water into hydrogen and oxygen.
In the given examples ice cream melts in a bowl is an example of a physical change.
A physical change occurs when a substance transforms from one state to another i.e., the change only affects its physical properties like color, volume, shape, and phase changes.
Using water as an example, if we have it at room temperature, it is a clear liquid. If we decrease the temperature below the freezing point, the water freezes and forms ice. If we increase the temperature above the boiling point, the water turns into a gas(steam). We can see that in all three forms, the water is still composed of two hydrogen atoms and one oxygen atom. Nothing is added or subtracted from it, which means the chemical composition stays the same. The transformation of water from liquid to solid or gas is an example of a physical change.
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Of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation _____ carbons are fully oxidized to _____, while _____ carbons remain in _____.
Of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation, two carbons are fully oxidized to CO2, while four carbons remain in acetyl groups.
This is further explained below.
What are acetyl groups.?Generally, The acetyl group is a functional group that is used in organic chemistry.
Its chemical formula is [tex]COCH_3,[/tex] and its structural formula is [tex]CCH_3.[/tex]Occasionally, the sign Ac will be used to symbolize it.
In the nomenclature used by the IUPAC, acetyl is referred to as ethanol, despite the fact that very few people actually use this name. A methyl group is found inside the acetyl group, and it is single-bonded to a carbonyl.
In conclusion, At the end of the pyruvate oxidation process, two of the six carbons that were present in the glucose molecule at the beginning are converted into carbon dioxide, while the other four carbons are still present as acetyl groups.
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Please answer most of the questions.
The statement one is incorrect because the elements in periodic table has some similarities between them they are not completely different from each other.
How come metals are reactive?The difference in stability between the electron configurations of metals as atoms and as ions is what causes metals to be reactive. Since they are all metals, when they interact, positive ions are produced.
The second statement is right and third statement is wrong because the most reactive group is group 1 or group 7 because group 1 wants to lose one electron to become stable and halogens want to gain one electron to become stable. Chlorine belongs to group 17 halogens , it is reactive.Krypton is noble gas it is very less reactive.Magnesium belongs to alkaline earth metal . Sodium , potassium and lithium are in one group that is alkali metals.Potassium caught fire easily so it is kept in kerosene , Sodium fizzed a lot and lithium fizzed bit.Ceisum would explode .To learn more about metals refer
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A student measured the string as 2.43 m long. The teacher said it was actually 2.12 m long.
What was the student's percent error?
What are some properties of plasma?
Plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.
What is plasmas?Plasmas is defined as a type of substance in which numerous electrons freely roam around the nuclei of the atoms.
Plasma has been referred to as the fourth state of matter, alongside solid, liquid, and gas.
When one or more electrons are ripped from an atom, they form a plasma.
Thus, plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.
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How many of each element would you find in AI(NO3)3?
a. Aluminum : _________
b. Hydrogen : __________
c. Oxygen : _____________
Answer:
you will find 3 in aluminium
hydrogen should be b 3
and oxygen is 9
Which of the elements shown below would you predict to be the most reactive? Justify your answer.
Answer:
Lithium is the most reactive out of them.
Explanation:
For this question, we will be looking at the valence electrons each one has. Valence electrons are the electrons that are on the outermost electron shell (the outer circle around each of them).
Lithium has 2 electron shells: the innermost has 2 electrons (this circle can only hold up to 2 electrons), and the outermost circle has 1 electron (this circle can hold up to 8 electrons).
Helium has only 1 electron shell and within it, it has 2 electrons (remember this is the maximum amount this circle can take).
Argon has 3 electron shells: the innermost has 2 electrons (the maximum this circle can have), the middle one has 8 electrons (the maximum this circle can have), and the outermost circle has 8 electrons around it (this circle also holds a maximum of 8 electrons).
Now let's look at the electrons present only on the outer shell of each of them (these are called valence electrons).
Lithium has only 1 electron on its outermost shell but this shell can have up to 8 electrons.
Helium has 2 electrons, the maximum amount that circle can have.
Argon has 8 electrons, the maximum that circle can have.
-Every atom has the goal of wanting to be stable, by completing the maximum amount on their outermost shell by either gaining or losing electrons.
Since Helium and Argon already have the maximum amount of electrons their outermost circle can have, they are already stable and neither want to gain or lose electrons.
Lithium is our only option that has an incomplete outermost electron shell with only 1 out of the 8 electrons it can have.
It is easier for Lithium to give away that 1 electron it has and then have a complete inner-circle after giving out that 1 electron (it would then look like Helium), than to gain 7 electrons and complete the circle.
This is why Lithium is very reactive, because it is constantly looking to find someone to give away their electron to and become stable. Lithium also has a charge of (+1), which means that it gives away one of its electrons.
A 1.25M solution of copper(III) sulfate is made with 670mL. How many grams of solute are required?
Molarity :
The number of moles of solute per liter of solution is known as molarity or molar concentration. It is used to express the concentration of a given solute in a solution.
It can be calculated using the formula, Molarity = [tex]\frac{number-of- moles-of-solute}{Volume-of-the-solution-in-liters}[/tex]
Given data:
Molarity of the solute, copper(III) sulfate = 1.25 M
Volume of the solution = 670 mL = 0.67 Liters
Then, Molar mass of the solute, = 415.2 g/mol
Then, number of moles of solute = Molarity x Volume of solution
= 1.25 x 0.67 = 0.8375 moles.
Then, Mass of the solute
= Molar mass of solute x number of moles of solute
= 415.2 g/mol x 0.8375 mol = 347.73 g.
Therefore, the mass of solute in grams required are = 347.73 g
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which solution is a buffer? which solution is a buffer? a solution that is 0.100 m in hno2 and 0.100 m in hcl a solution that is 0.100 m in hno2 and 0.100 m in nano2 a solution that is 0.100 m in hno3 and 0.100 m in nano3 a solution that is 0.100 m in hno2 and 0.100 m in nacl
The solution that is a buffer is a solution that is 0.100 M in HNO₂ and 0.100 M in NaNO₂ .
A weak acid and its conjugate base, or a weak base and its conjugate acid, must be combined to create a buffer solution. Only HNO2 (Weak Acid) and NaNO2 are included in the list as an acid and its conjugate base (Conjugate Base). Given that all concentrations are equivalent, the pH of this solution would be the same as the pKa of HNO2 (3,15).
Acids that don't entirely dissociate in solution are referred to as weak acids. In other words, any acid that is not a strong acid qualifies as a weak acid. The amount of dissociation determines how strong an acid is; the more dissociation, the stronger the acid.
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a commonly used biological buffer is a made from a weak acid/conjugate base pair called ""tris"". the pka for tris acid is 8.06. you have 1.00 liters of a solution where the concentration of tris acid (ha) is 0.200 m and the concentration of tris base (a-) is 0.150 m. what is the ph of the solution?
The pH of the solution is 7.94 if the concentration of the tris acid is 0.200m and the concentration of the conjugate base is 0.150m.
The pH of this buffer can be calculated using the Henderson-Hasselbalch equation according to which the pH is equal to the sum of the pKa value and the log of the concentration of conjugate base divided by the concentration of the weak acid.
This equation can be represented as;
pH = pKa + log ([conjugate base] ÷ [weak acid])
Substituting the given values into this equation to find the pH;
pH = 8.06 + log([0.150] ÷ [0.200])
pH = 8.06 + log(0.75)
pH = 8.06 + (-0.125)
pH = 7.94
Therefore the pH of this solution is calculated to be 7.94.
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Claim-evidence-reasoning: populations of organisms that reproduce asexually tend to show less variation from one individual to another. why might this be? make a claim and use your scientific reasoning skills to support your claim. cer claim: evidence: reasoning
Asexual reproduction prevents genetic variation within a species since it ensures that all offspring have an identical copy of the parent's DNA unless a mutation arises in the duplicate DNA that is produced.
Why is there no diversity in reproduction from a single parent?Sexual and asexual reproduction are the two options. In sexual reproduction, there are two parents. However, only one parent is engaged in asexual reproduction. In this, offspring of a single parent are genetically identical to the parent. Offspring are physically and genetically similar to their parents. They are a clone or exact replica of the parent. Asexual reproduction doesn't involve any genetic material being recombined.
Thus, the person created by asexual reproduction does not exhibit variety or genetic variability.
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A hiker climbs to the top of a mountain at rate of 0.5 me/hr. What are the speed and velocity of the hiker?
A hiker climbs to the top of a mountain at rate of 0.5 m/hr. The speed of hiker is 1.3 x 10⁻⁴ m/s and the velocity of the hiker is 1.3 x 10⁻⁴ m/s west.
Speed is a scalar quantity. It is used to measure the distance traveled in a period of time. It is represented by -
s = d/Δt
where,
s = speed
d = distance
Δt = change in time
Velocity is a vector quantity. It is used to measure the change in position, that is, displacement over the change in time. It is represented by -
v = Δs / Δt
where,
v = velocity
Δs = change in position/displacement
Δt = change in time
The standard unit of velocity and speed both is m/s.
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the element tellurium forms a(n) with the charge fill in the blank 2. the symbol for this ion is , and the name is fill in the blank 4 ion. the number of electrons in this ion is .
The element tellurium forms an ion with the charge of +4.
The symbol for this ion is Te⁴⁺ and the name is tellurium ion.
The number of electrons in this ion is 48 electrons.
What are ions?Ions are substances that are formed when atoms of elements gain or lose electrons.
There are two types of ions based on the charge the ions carry:
Cations - they have a positive charge; for example, calcium ion, Ca²⁺, ammonium ion, NH₄⁺Anions - they have a negative charge; for example Chloride ion, Cl⁻, tetraoxosulfate (vi) ion, SO₄²⁻Metallic atoms form cations by losing one or more electrons.
Non-metallic atoms form negative ions by gaining one or more electrons.
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What is the equation for kinetic energy?
KE=1/2 mV^2
m=mass
V=velocity
You will be preparing dilutions of the stock solution and measure their absorbances. According to beer’s law, predict how the absorbance of the stock solution will compare to the measured absorbances for the diluted solution.
Answer: As a solution is diluted, the absorbance of the solution is decreased
Explanation: As a solution is diluted, the absorbance of the solution is decreased. The concept of dilution relates molar concentration and volume.M1V1=M2V2. If a 1.0 liter of a 1.0 molar solution is diluted to 2.0 molar solution, the new molar concentration is 0.50. The new concentration has been reduced by one half as the volume was doubled.Beer's law relates the concept of concentration and absorbance. According to this law, absorbance and concentration are directly proportional. If you increase the original concentration, the absorbance increases and if you dilute the solution(which means you decrease the original concentration), the absorbance will decrease in direct proportion. ;)
According to the Beer's law the absorbance of solution is directly proportional to concentration,hence on dilution the concentration decreases which decreases absorbance on a whole.
What is Beer's law?The Beer's law states that the absorbance is directly proportional to the concentration of a solution that is,A∝C .Most substances follow Beer's law from low to moderate temperature ranges only.It is not followed well in case of saturation effects which are present in highly concentrated samples.
Due to the direct relation between absorbance and concentration , absorbance is preferred over transmittance for recording the spectra.
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