Given that :
Reaction equation ; [tex]HB_{r} + KOH ---> KBr + H_{2}O[/tex]
A) and B) Determine the Initial pH before addition of titrant
First step : compute the value of pOH
pOH = - log ( [OH⁻])
= -log ( 0.320 ) = 0.50
∴ Initial pH before the titrant is added = 14 - pOH
= 14 - 0.5 = 13.5
C ) Determine the pH of solution after 5 mL titrant is added
First step : determine the reacting moles of each substance
n kOH = 0.025 mL * 0.320 mol/L = 0.00800 mol
n HBr = 0.005 * 0.750 mol/L = 0.00375 mol
next step : compute the value of the concentration of OH⁻ in final solution
n kOH ( remaining ) = 0.00800 - 0.00375 = 0.00425 mol
final solution = 25.00 mL + 5.00 mL = 30.00 mL
∴ The value of the concentration of [ OH⁻] in 30.00 mL
= [ OH⁻] = ( 0.0042 mol / 0.0300 mL )
= 0.142 M
hence pOH = - log (0.142) = 0.849
Final step; The pH of the solution after 5 mL of titrant is added
= 14 - pOH
= 14 - 0.849 = 13.15
Hence we can conclude that the initial pH before titrant was added is 13.50 and the pH after is as listed above.
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Constants: A: MW = 150 g/mol; B: = MW 100 g/mol; C: MW = 200 g/mol. 2.0 g C was made from 4.5 g A and 4.0 g
a. Calculate the yield for the following reaction: 3A + B -> C
b. Calculate the yield for the following reaction: 2A + 3B -> C
c. Calculate the yield for the following reaction: A + B->3C
Answer:
a. 100%
b. 133%
c. 300%
Explanation:
To find yield first we need to determine theoretical yield converting each reactant to moles and find limitng reactant for each reaction:
Moles A:
4.5g * (1mol / 150g) = 0.03 moles
Moles B:
4.0g * (1mol / 100g) = 0.04 moles
a. For a complete reaction of 0.03 moles of A are needed:
0.03 moles A * (1 mole B / 3 moles A) = 0.01 moles of B
As there are 0.04 moles of B, A is limiting reactant.
Theoretical moles and mass of C are:
0.03 moles A * (1 mole C / 3 moles A) = 0.01 moles of C.
0.01 moles of C * (200g / mol) = 2g are produced.
Yield is:
2g / 2g * 100 = 100%
b. For a complete reaction of 0.03 moles of A are needed:
0.03 moles A * (3 mole B / 2 moles A) = 0.045 moles of B
As there are 0.04 moles of B, B is limiting reactant.
Theoretical moles and mass of C are:
0.04 moles B * (1 mole C / 3 moles B) = 0.0133 moles of C.
0.0133 moles of C * (200g / mol) = 2.67g are produced.
Yield is:
2.67g / 2g * 100 = 133%
c. For a complete reaction of 0.03 moles of A are needed:
0.03 moles A * (1 mole B / 1 moles A) = 0.03 moles of B
As there are 0.04 moles of B, A is limiting reactant.
Theoretical moles and mass of C are:
0.03 moles A * (1 mole C / 1 moles A) = 0.03 moles of C.
0.03 moles of C * (200g / mol) = 6g are produced.
Yield is:
6g / 2g * 100 = 300%
which materials conduct heat most easily
Answer:
Metal, Copper, and Alluminum
Explanation: It is what it is
choose all the pairs of elements that will form a compound with an covalent/molecular bond
a. phosphorus and iodine
b. rubidium and fluorine
c. sulfur and chlorine
d. aluminum and bromine
Answer:
B
Explanation:
PLZZZZZ HELPP: How might the fact that multiple approaches yield the same result contribute to the development of a theory? The accumulation of information from multiple approaches provides ample evidence to support the theory. Scientists are more likely to develop a theory for a concept that is a popular area of research. Evidence from multiple approaches might prevent a poorly developed theory from being accepted. The number of observations from multiple approaches usually exceeds the number that is required.
Answer: multiple approaches yield the same result positively contributes to the development of a theory since it shows that the conclusions are sound and not based on other factors such as the environment of the experiment, the researches, etc.
Your welcome . <3Answer:
I'm not positive this is the answer but my guess would be C: Evidence from multiple approaches might prevent a poorly developed theory from being accepted.
Could someone draw me electron dot diagrams? The Hydride Ion, Hydrogen Ion, Aluminum Ion, Nitride Ion, Oxide Ion, and Calcium Ion, and Sodium-Ion dot structures? Thanks!
Answer:
urorrr
Explanation:
hahhahahahahhaahah oki nam omy mymy mymy
Which statement describes effusion?
A) It occurs when a gas passes through a tiny hole.
B) It occurs when a liquid passes through a tiny hole.
C) It occurs when gas molecules disperse throughout a container.
D) It occurs when a liquid disperses throughout a container.
Answer:
choice A
Explanation:
it it occurs when a gas escapes from a container through a hole of diameter.
Answer:
A. It occurs when a gas passes through a tiny hole.
Explanation:
Edge2020
Have a great day y'all :)
How are scientific questions answered? OA. Through feelings and guesses
B. Through likes and dislikes
C. Through beliefs and opinions
D. Through measuring and observing
Is CO2
an atom or a molecule and is it a pure element or a
compound?
a. Atom, Compound
b. Molecule, Pure element
c. Molecule, Compound
Answer:
C
Explanation:
CO2 is a molecule because it is compose of atoms which made it a molecule, it can also be call a compound.
Answer:
I believe it is c. Molecule, Pure compound
Explanation:
this is because it is composed of atoms which create molecule.
Calculate the following equation (2.55 -0.7)*4.3
Answer:
-7.6755
Explanation:
Calculate
I calculate it
Please help me it’s due today at 7:40pm please please help me please people please
Answer:
action, reaction
Explanation:
Answer:
for every action there is an equal and opposite reaction
What is the noble gas electron configuration of aluminum (Al)?
Answer:
[Ne] 3s² 3p¹
Explanation:
At a certain temperature, the solubility of aluminum hydroxide is (8.1x10^-13) M. What is the Ksp at this temperature?
Answer:
4.2x10⁻⁴ M or 0.032 g/L.
Explanation:
Hello!
In this case, for solubility product problems, we apply the concepts of equilibrium because an insoluble salt is ionized until a certain point limited by the solubility product constant, Ksp. Thus, we first write the ionization reaction of aluminum hydroxide at equilibrium:
[tex]Al(OH)_3(s)\rightleftharpoons Al^{3+}(aq)+3OH^-(aq)[/tex]
Next, we write the corresponding equilibrium expression:
[tex]Ksp=[Al^{3+}][OH^-]^3[/tex]
Which in terms of [tex]x[/tex], the reaction extent, is:
[tex]Ksp=x*(3x)^3[/tex]
Because [tex]x[/tex] also represents the molar solubility of aluminum hydroxide at the considered temperature; now, we can write:
[tex]8.1x10^{-13}=x*(3x)^3[/tex]
Which can be solved for x as follows:
[tex]x=\sqrt[4]{\frac{8.1x10^{-13}}{27} } \\\\x=4.2x10^{-4}M[/tex]
Thus, the solubility is 4.2x10⁻⁴ M or mol/L and in g/L we have:
[tex]4.2x10^{-4}\frac{mol}{L}*\frac{78g}{1mol} =0.032\frac{g}{L}[/tex]
Best regards!
Kidney stones are caused by the precipitation of either calcium oxalate, Ca(C2O4), or calcium phosphate, Ca3(PO4)2, in the kidneys. If the normal concentration of Ca2+ in the kidneys is 2.5 mM, at what concentration of oxalate ion will kidney stones begin to form?
Answer:
1.1 × 10⁻⁶ M
Explanation:
Step 1: Given and required data
Concentration of Ca²⁺ ([Ca²⁺]): 2.5 mM = 2.5 × 10⁻³ MCalcium oxalate solubility product constant (Ksp): 2.7 × 10⁻⁹Step 2: Write the balanced equation for the solution reaction of calcium oxalate
CaC₂O₄(s) ⇄ Ca²⁺(aq) + C₂O₄²⁻(aq)
Step 3: Calculate the concentration of the oxalate ion to begin the precipitation of calcium oxalate
We will use the Ksp of calcium oxalate.
Ksp = 2.7 × 10⁻⁹ = [Ca²⁺].[C₂O₄²⁻]
[C₂O₄²⁻] = Ksp / [Ca²⁺]
[C₂O₄²⁻] = 2.7 × 10⁻⁹ / 2.5 × 10⁻³
[C₂O₄²⁻] = 1.1 × 10⁻⁶ M
Kidney stones are the calcareous stones formed in the kidney of the excretory system. The initial concentration of oxalate ion was [tex]1.1 \times 10^{-6} \;\rm M.[/tex]
What is concentration?Concentration is the amount of the substance present in the sample and can be calculated by the solubility constant of the products.
Given,
Concentration of calcium = 2.5mM
The solubility product constant = [tex]2.7 \times 10^{-9}[/tex]
The balanced chemical reaction for calcium oxalate can be written as:
[tex]\rm CaC_{2}O_{4}(s) \leftrightharpoons Ca^{2+}(aq) + C_{2}O_{4}^{2-}(aq)[/tex]
The concentration of oxalate ions by Ksp is calculated as:
[tex]\begin{aligned} [C_{2}O_{4}^{2-}] &= \rm \dfrac {Ksp}{[Ca^{2+}]}\\\\&= \dfrac{2.7 \times 10^{-9}}{2.5 \times 10^{-3}}\\\\&= 1.1 \times 10^{-6}\;\rm M\end{aligned}[/tex]
Therefore, [tex]1.1 \times 10^{-6} \;\rm M[/tex] is the concentration of oxalate ion.
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What is the wavelength of a photon with an energy of 3.50 x 10^-19 J ?
Answer:
λ = 5.68×10⁻⁷ m
Explanation:
Given data:
Energy of photon = 3.50 ×10⁻¹⁹ J
Wavelength of photon = ?
Solution:
E = hc/λ
h = planck's constant = 6.63×10⁻³⁴ Js
c = 3×10⁸ m/s
Now we will put the values in formula.
3.50 ×10⁻¹⁹ J = 6.63×10⁻³⁴ Js × 3×10⁸ m/s/ λ
λ = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 3.50 ×10⁻¹⁹ J
λ = 19.89×10⁻²⁶ J.m / 3.50 ×10⁻¹⁹ J
λ = 5.68×10⁻⁷ m
Can gravity be considered a force? Explain your reasoning
Answer:
I think that gravity can be considered a force.
Explanation:
As the object falls, it moves faster and faster. Gravity is considered a universal force because it acts between any two masses anywhere in the universe. For example, there is a gravitational pull between the Sun and the Moon. Even small masses attract one another.
Hope this helped! :)
If the concentration of the stock (provided) Cu(NH3)42 was 0.041 M, what concentration will the Cu2 be in beaker?
Answer:
[tex][Cu^{2+}]=0.041 M[/tex]
Explanation:
Hello!
In this case, since the molarity of a solution is defined in terms of the moles of the solute and the volume of solution, given that the concentration of Cu(NH₃)₄²⁺ is 0.041 M, and there is only one copper atom per Cu(NH₃)₄²⁺ ion, we can compute the concentration of Cu²⁺ as shown below:
[tex][Cu^{2+}]=0.041\frac{molCu(NH_3)_4^{2+}}{L}*\frac{1molCu^{2+}}{1molCu(NH_3)_4^{2+}} =0.041 \frac{molCu(NH_3)_4^{2+}}{L}[/tex]
[tex][Cu^{2+}]=0.041 M[/tex]
Best regards!
Any science fair project ideas? Something for 7th or 8th grade level.
Answer:
maybe try to do something with electricity?
Explanation:
give me an update on when u find one :) cant wait to see it
Please answer this question
Answer:
I'm not an expert at this, but I assume its mercury.
How do the ionic radii vary within a group of metals?
Answer:
ionic radii is a half the distance between two ions
Explanation:
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7)
According to your lab procedure, identify the chemicals necessary to produce NH3(g).
Write a net ionic equation for the generation of NH3(g).
Answer:
Explanation:
Chemicals to produce NH₃ ( ammonia )
1 ) Ammonium chloride ( NH₄Cl )
2 ) Calcium hydroxide Ca(OH)₂
2NH₄Cl + Ca(OH)₂ = CaCl₂ + 2NH₃ + 2H₂O.
Net Ionic equation
2NH₄⁺ ( aq ) + 2OH⁻ (aq ) = 2NH₃(g) + 2H₂O .
Who was the creator of the atomic bomb and why was he against the project?
Answer:Robert Oppenheimer went on to become chairman of the General Advisory Committee of the Atomic Energy Commission, which, in October 1949, opposed the development of the hydrogen bomb. This shocking opposition led to accusations that Oppenheimer was a Communist supporter.
Explanation:
Name a substance/solution that could be used to distinguish alkane from an alkene.
Answer: Bromine water
Explanation:
Alkanes are saturated hydrocarbons with single bond and the alkenes as unsaturated hydrocarbons with double bonds.
Bromine water is a chemical reagent which is used to distinguish between alkane and alkene.
It is of orange color in solution form and turns to colorless in alkene.
The alkanes to show any reaction with bromine water.
What is the pressure in atmospheres exerted by a column of water that is 12.5 m
high?
(density of water = 1.00g/cm3; gravitational constant = 9.80665 m/s2, 1 atm =
101,325 Pa = 760 torr = 760 mmHg)
Answer:
0.00121 atm
Explanation:
Step 1: Given data
Height of the column of water (h): 12.5 mDensity of water (ρ): 1.00g/cm³Gravitational constant (g): 9.80665 m/s²Step 2: Calculate the pressure exerted by the column of water in SI units
The pressure exerted by the column of liquid depends on the height of the column, the density of the liquid and the gravitational constant. We can calculate it using the following expression.
P = ρ × g × h
P = 1.00g/cm³ × 9.80665 m/s² × 12.5 m
P = 123 Pa
Step 3: Convert "P" to atm
We will use the conversion factor 101325 Pa = 1 atm.
123 Pa × (1 atm/101325 Pa) = 0.00121 atm
100,000 years in the geologic history of Earth would be considered
Answer:
". It will mark the time since humans began altering Earth. Starting about 10,000 years ago, it is tentatively being called the Anthropocene."
i dont know if tht will help
100,000 years in the geologic history of Earth would be considered
as Anthropocene .
What is Anthropocene?
The first and most recent geological epoch in Earth's history when human life began to have a noticeable influence on the planet's climate, including ecosystems, and ecosystems, is referred to as the Anthropocene Epoch. This term refers to an undefined unit of geologic time.
It would be the first time since people started changing the planet. It must be tentatively referred to as the Anthropocene and began around 10,000 years ago.
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How many molecules are contained 9.6 mol C2H4?
Answer:
N = 5.8 × 10²⁴ molecules
Explanation:
Step 1: Given and required data
Moles of C₂H₄ (n): 9.6 molAvogadro's number (NA): 6.02 × 10²³ molecules/molStep 2: Calculate the number of molecules (N) in 9.6 moles of C₂H₄
To convert moles to molecules we need Avogadro's number: there are 6.02 × 10²³ molecules of C₂H₄ per mole of C₂H₄
N = n × NA
N = 9.6 mol × 6.02 × 10²³ molecules/mol
N = 5.8 × 10²⁴ molecules
The crust and upper mantle make up Earth's ____.
a. lithosphere
b. asthenosphere
c. core
d. continents
Answer:
a. the lithosphere
Explanation:
An aqueous solution of potassium hydroxide is standardized by titration with a 0.187 M solution of nitric acid. If 22.7 mL of base are required to neutralize 29.4 mL of the acid, what is the molarity of the potassium hydroxide solution?
Answer:
Explanation:
29.4 mL of nitric acid having molarity of .187M reacts with 22.7 mL of potassium hydroxide .
moles contained in nitric acid solution
= .0294 x .187 moles
= 5.5 x 10⁻³ moles
This must have been reacted with same amount of moles of base
moles of sodium hydroxide in 22.7 mL of solution = 5.5 x 10⁻³ moles
molarity of base solution = 5.5 x 10⁻³ / 22.7 x 10⁻³
= .24 M .
What is the name of the product that forms when sodium hydroxide reacts with propanoic acid is?
Answer:
Propionic acid reacts with NaOH(aq) to form sodium propionate and water.
Explanation:
.
What is the formula for hydrophosphoric acid?
Answer:
H3PO4 is the formula for hydrophosphoric acid
The chemical formula of hydrophosphoric acid is H₃PO₄ which is a mineral acid of phosphorous.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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PLEASE HURRY
Which input value produces the same output value for the two functions on the graph. f(x) = - x+
g(x) = ģx-2
.
x= -3
x= -1
X = 1
x= 3
Answer:
3
Explanation:
Your problem statement tells you .... f(x) passes through point (3, negative 1) g(x) passes through point (3, negative 1) This tells you the input value that produces the same output value for the two functions is 3, and that output value is -1.