combustion always result in to formation of water. what other type of reactions may result into formation of water? examples of these reactions
As combustion always result into the formation of water, the other type of reactions that may result into formation of water are Acid-Base Neutralization Reactions and Hydrogen and Oxygen Reaction.
Acid-Base Neutralization Reactions:
A neutralisation reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products.
H⁺ ions and OH⁻ ions combine to generate water during a neutralisation reaction. Acid-base neutralisation is the most common type of neutralisation reaction.
Example: Formation of Sodium Chloride (Common Salt):
HCl + NaOH → NaCl + H₂O
Hydrogen and Oxygen Reaction:
Water vapour is created when hydrogen gas (H₂) and oxygen gas (O₂) are combined directly. This reaction produces a lot of heat and releases a lot of energy.
Example: 2 H₂ + O₂ → 2 H₂O
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An aqueous solution of 4mol/L nitric acid is eletrolysed in an electrolytic cell using graphite electrodes. Write the chemical symbols for all the ions present in the electrolytic cell.
Electrolysis of nitric acid produces hydrogen gas at the cathode and nitrogen dioxide, oxygen gas, and hydrogen ions at the anode.
When an aqueous solution of 4mol/L nitric acid is electrolyzed in an electrolytic cell using graphite electrodes, the following chemical symbols for all the ions present in the electrolytic cell are obtained:A) The anode equation: 2HNO₃ → 2NO₂ + O₂ + 2H⁺ + 2e⁻The anions present in the electrolytic cell include nitrate ions (NO₃⁻) and chloride ions (Cl⁻). The nitrate ions, which are the conjugate base of nitric acid (HNO₃), are attracted to the anode where they lose electrons to produce nitrogen dioxide (NO₂), oxygen gas (O₂), and hydrogen ions (H⁺). Nitric oxide (NO) and nitrogen gas (N₂) can also be formed as by-products.B) The cathode equation: H⁺ + e⁻ → 1/2H₂The cations present in the electrolytic cell include hydrogen ions (H⁺) and nitrate ions (NO₃⁻). Hydrogen ions (H⁺) in the electrolytic cell are reduced by gaining electrons at the cathode to produce hydrogen gas (H₂). Nitrate ions (NO₃⁻) from nitric acid are not reduced at the cathode but migrate toward the anode. In summary, nitric acid, when electrolyzed in an electrolytic cell using graphite electrodes, produces hydrogen gas at the cathode and nitrogen dioxide, oxygen gas, and hydrogen ions at the anode. The conjugate base of nitric acid, nitrate ions, is present as anions in the electrolytic cell. The cations present in the electrolytic cell are hydrogen ions and nitrate ions.For more questions on Electrolysis
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Convert 6.13 mg per kg determine the correct dose in g for 175lb patient
The correct dose for a 175 lb patient would be approximately 0.48602 grams.
To convert 6.13 mg/kg to grams, we need to consider the weight of the patient and perform a unit conversion. Here's the step-by-step process:
1. Convert the weight of the patient from pounds to kilograms.
175 lb * (1 kg / 2.205 lb) = 79.37 kg (rounded to two decimal places)
2. Calculate the correct dose in grams by multiplying the patient's weight by the given dosage.
79.37 kg * 6.13 mg/kg = 486.02 mg
3. Convert the dose from milligrams (mg) to grams (g) by dividing by 1000.
486.02 mg / 1000 = 0.48602 g (rounded to five decimal places)
Therefore, the correct dose for a 175 lb patient would be approximately 0.48602 grams.
It's important to note that this calculation assumes the dosage is based on body weight and that the given dosage is appropriate for the patient's condition. Always consult a healthcare professional or follow the instructions of a medical prescription for accurate dosing information.
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which number is correctly expressed in scientific notation
Answer:
x*10ⁿ (units)
Explanation:
Scientific notation never has leading or trailing zeros.
0.0064 would be expressed as 6.4*10³
6400 would be expressed as 6.4*10³
multiplying by 10 to an exponent just adds or subtracts zeros, so count how many zeros have to be added or subtracted, and multiply by 10ⁿ, where n is how far from the decimal point.
Rank these least polar=1 to most polar=11 and why the most polar is the most polar
To rank these least polar=1 to most polar=11, we need to understand what polarity is. The term "polarity" refers to the distribution of electrical charge in a molecule.
A molecule is polar if its electron cloud is distributed unevenly and has poles, resulting in the molecule having a positive and a negative end. A molecule is nonpolar if its electron cloud is distributed uniformly, resulting in the molecule having no charge poles.
The ranking of the given compounds from least polar to most polar is as follows:
Least polar: 7 (nonpolar)
4 (nonpolar)
9 (nonpolar)
1 (nonpolar)
8 (polar)
2 (polar)
6 (polar)
5 (polar)
10 (polar)
3 (most polar)
Most polar: 3 (most polar)
The reasoning behind this ranking is that the difference in electronegativity between the two atoms that make up the molecule determines polarity.
The greater the difference in electronegativity between two atoms, the more polar the bond between them is. As a result, we can classify the compounds as nonpolar and polar. We rank these compounds based on their polarity, with the least polar being nonpolar and the most polar being polar.
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8) After school, you stop into Speedway to get a fountain drink. When you push on the lever to
expel your soda pop, it just drips out. The manager tells you that his fountain machine is set at
12°C for 450 mL of pop at an unknown pressure. Being a curious chemistry student, you decide
to investigate: Fountain drinks should be an average temperature of 5°C for 355mL at a pressure
of 7psl. What pressure does the manager have his pop machine set at in both psi & atm?
The pressure (P) of the manager's pop machine is 0.38 psi or 0.026 atm.
Given the following values:
Temperature (T) = 12 °C
Volume (V) = 450 mL = 0.45 L
Pressure (P) = UnknownTemperature (T) = 5 °C
Volume (V) = 355 mL = 0.355 L
Pressure (P) = 7 psi = 0.48 atm
To find the pressure (P) of the manager's pop machine in both psi and atm, we can use the Ideal Gas Law, which is given by: PV = nRT
Where:
P = Pressure V = Volume T = Temperature n = Number of moles R = Universal gas constant
Let's first convert the volume and temperature to SI units.
Volume (V) = 0.45 L
Temperature (T) = 12 + 273 = 285 K
For the first condition, we have: P1V1/T1 = nR/P1V1/T1 = P2V2/T2 (At constant temperature and volume)
P2 = P1(V2/V1)
For the second condition, we have: P1V1/T1 = P2V2/T2P2 = (P1V1T2)/(V2T1)
Now, let's plug in the values.P1 = ?V1 = 0.45 LT1 = 285 KP2 = 7 psi = 0.48 atmV2 = 0.355 LT2 = 278 K (5°C + 273)
First, we'll find the pressure (P) in psi. P2 = P1(V2/V1)0.48 = P1(0.355/0.45)P1 = 0.38 psi
To convert psi to atm, we use the following conversion factor: 1 atm = 14.7 psi0.38 psi x (1 atm/14.7 psi) = 0.026 atm.
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A spatula of sodium hydrogen carbonate was placed in a boiling tube.lemon juice was added dropwise while shaking until no other change was seen. Give the expected observation and explain it
Answer:
When sodium hydrogen carbonate (also known as baking soda) reacts with lemon juice (which is acidic), a chemical reaction occurs. The expected observations and the explanation for each observation are as follows:
1. Effervescence (bubbling): As the lemon juice (citric acid) reacts with sodium hydrogen carbonate, carbon dioxide gas is produced. This gas escapes as bubbles, leading to effervescence. The reaction can be represented as follows:
Sodium Hydrogen Carbonate + Citric Acid → Carbon Dioxide + Water + Sodium Citrate
2. Release of a citric-like odor: When citric acid from the lemon juice reacts with the sodium hydrogen carbonate, it forms sodium citrate, which has a fruity odor similar to citric acid.
3. Change in color or formation of foam: Depending on the specific lemon juice used, there might be a color change or the formation of foam due to the interaction between the citric acid and the baking soda. This observation can vary depending on the concentration of the lemon juice and the amount of baking soda used.
4. No further visible change: Once the reaction is complete, there will be no other visible changes. The carbon dioxide gas produced during the reaction will dissipate into the air, and the solution will reach a new equilibrium.
Overall, the reaction between sodium hydrogen carbonate and lemon juice is an acid-base reaction, resulting in the production of carbon dioxide gas. This reaction is commonly used in baking to create a leavening effect and make baked goods rise.
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Which chemical equation represents a precipitation reaction ?
The correct option that represents a precipitation reaction is:
B. K2CO3 + PbCl2 -> 2KCl + PbCO3
In a precipitation reaction, two aqueous solutions are mixed, resulting in the formation of an insoluble solid called a precipitate. This solid is formed due to the combination of certain ions that are no longer soluble in the solution.
In option B, when potassium carbonate (K2CO3) reacts with lead chloride (PbCl2), it produces potassium chloride (2KCl) and lead carbonate (PbCO3) as the products. Lead carbonate is an insoluble compound and forms a precipitate, which indicates a precipitation reaction.
Options A, C, and D do not represent precipitation reactions:
- Option A represents a double displacement reaction between magnesium bromide (MgBr2) and hydrochloric acid (HCl), resulting in the formation of magnesium chloride (MgCl2) and hydrogen bromide (HBr).
- Option C represents a substitution reaction between lithium acetate (LiC2H3O2) and tetrabromotitanium (IV) (TiBr4), forming lithium bromide (LiBr) and tetrakis(acetato) titanium (IV) (Ti(C2H3O2)4).
- Option D represents a double displacement reaction between ammonium nitrate (NH4NO3) and copper chloride (CuCl2), resulting in the formation of ammonium chloride (NH4Cl) and copper nitrate (Cu(NO3)2).
Therefore, option B is the correct representation of a precipitation reaction.
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What does percent composition tell you about a molecule?
Answer:
Percent composition tells you the relative amounts of each element in a molecule by mass. It can be used to determine the empirical formula of a compound, as well as to compare the composition of different molecules.
For example, the percent composition of water (H2O) is 11.19% hydrogen and 88.81% oxygen by mass. This tells us that there are two hydrogen atoms for every one oxygen atom in the molecule.
Explanation:
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QUESTION 4 Draw dots-and-crosses diagrams (showing outer electrons only) for the following covalent compounds: Ammonia, NH34.2 Hydrogen sulphide, H2S Hydrogen iodide, HI Nitrogen trichloride, NC13 Boron trifluoride, BF3
The Lewis structure of the compounds that we gave are shown in the image attached.
What is the electron dot diagram?The valence electrons of an atom in a molecule are shown in an electron dot diagram, sometimes referred to as a Lewis dot diagram or Lewis structure. It depicts the outermost electrons surrounding an atomic symbol using dots or other symbols to show their interconnectedness and distribution within a chemical species.
The idea behind the electron dot diagram is that in order to establish a stable electron configuration resembling that of a noble gas, atoms tend to gain, lose, or share electrons. The chemical behavior and reactivity of an atom are determined by the quantity of valence electrons.
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Trend of atomic number and atomic size of the elements when we move from left to right in different periods of periodic table
Answer:
The atomic size decreases with an increase in atomic number when we move from left to right.
Explanation: Hope it helps you:))))))
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Select the correct terms to complete this statement about charged particles.
Like charges attract | repel, and opposite charges attract repel. According to Coulomb's law, as the distance between two charged particles decreases, the force between the particles decreases I increases. As the magnitude of the charges decreases, the force decreases | increases.
Like charges repel each other, while opposite charges attract each other. This principle is one of the fundamental aspects of electrostatics. According to Coulomb's law, the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
As the distance between two charged particles decreases, the force between them increases. This is because the closer the particles are, the stronger the electric field they create, leading to a stronger force of interaction.
On the other hand, as the magnitude of the charges decreases, the force between the particles also decreases. This is because the force is directly proportional to the product of the charges. If one or both of the charges are smaller, the force they exert on each other will be weaker.
In summary, according to Coulomb's law, decreasing the distance between charged particles increases the force between them, while decreasing the magnitude of the charges decreases the force. This understanding of the relationship between charge, distance, and force is crucial in explaining the behavior of charged particles and the interactions between them.
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7. [day Dr. Linus Pauling says that if you take 1500. mg of vitamin C each day you will have milder and fewer colds. How many pounds per year is this? (assume 365 days per year)
Taking 1500 mg of vitamin C daily amounts to approximately 1.2045 pounds per year.
Dr. Linus Pauling suggested that taking 1500 mg of vitamin C daily could result in milder and fewer colds. To determine the weight in pounds per year, we'll first convert milligrams to pounds and then multiply by the number of days in a year.
To convert milligrams to pounds, we need to know that there are 453,592.37 milligrams in a pound. Therefore, 1500 mg is equal to 0.0033 pounds (1500 mg / 453,592.37 mg/lb).
Now, to calculate the weight in pounds per year, we'll multiply 0.0033 pounds by the number of days in a year (365).
Weight in pounds per year = 0.0033 pounds/day * 365 days/year = 1.2045 pounds/year.
Therefore, taking 1500 mg of vitamin C daily amounts to approximately 1.2045 pounds per year.
It's important to note that while this calculation provides the weight equivalent, the effectiveness and recommended dosage of vitamin C for preventing colds should be discussed with a healthcare professional, as individual needs may vary.
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5 organic functional groups similar to morphine and cannabinol
A 50.0g solution contains 10.0g of sucrose. Calculate the molarity of the solution
Answer:
solution is 0.584 M
Explanation:
what three forces are in tug of war?
The diagram represents a voltaic cell.
Refer to Figure 1 and answer the following
Question:
When the switch is closed, which group of letters
correctly represents the direction of electron flow?
The direction in which the electron flows in the voltaic cell can be shown by A, B, C, D. Option A
What is the voltaic cell?
A voltaic cell, often referred to as a galvanic cell, is an electrochemical device that uses a redox (reduction-oxidation) reaction to transform chemical energy into electrical energy. It is made up of two half-cells joined together by a conductive channel, allowing electrons to move freely between them. An electrode dipped in an electrolyte solution is present in each half-cell.
To keep the electrical balance in the half-cells, the passage of electrons is accompanied by ion mobility through the electrolyte solutions. The redox process might continue as a result of the ions' mobility, which completes the circuit.
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What does the latent heat of fusion measure?
• A. The energy required to melt a substance
B. The energy required to boil a substance
• c. The energy required to heat a substance
• D. The energy required to form a substance
The latent heat of fusion measures " The energy required to melt a substance" option (A).
The latent heat of fusion refers to the amount of energy required to change a substance from a solid state to a liquid state at its melting point while keeping the temperature constant. It is a specific type of latent heat that measures the energy needed for the phase transition of a substance.
When a substance is in a solid state, its particles are tightly packed and have a regular arrangement. As heat is added to the substance, its temperature gradually rises until it reaches the melting point. At this point, further addition of heat does not increase the temperature but instead causes the substance to undergo a phase change and transform into a liquid state. The energy absorbed during this process is known as the latent heat of fusion.
This energy is used to overcome the attractive forces between the particles in the solid and allow them to break free and move more freely in the liquid state. The latent heat of fusion is crucial in various practical applications, such as melting ice, changing solid metals into liquid form for casting, or utilizing phase change materials for thermal energy storage.
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Thomas wants to measure the temperature change that occurs when sodium hydroxide is dissolved in water.
Which is the best tool for this purpose?
Answer: A thermometer
Explanation: The best tool for measuring temperature change in this scenario would be a thermometer. A thermometer is specifically designed to measure temperature and can accurately indicate changes in temperature when substances are mixed or undergo reactions. When sodium hydroxide (NaOH) is dissolved in water, it is an exothermic reaction, meaning it releases heat. By using a thermometer, Thomas can monitor and measure the temperature change that occurs as sodium hydroxide dissolves in water. It is important to select a suitable thermometer that can accurately measure the desired temperature range and ensure that it is calibrated correctly for accurate readings. Additionally, it is advisable to use a thermometer that is specifically designed for liquid measurements, such as a liquid-in-glass thermometer or a digital thermometer with a suitable probe for liquid measurements. These types of thermometers provide reliable temperature readings and are commonly used in scientific experiments and laboratory settings to measure temperature changes accurately.
What is the molar mass of N2CO3
Answer:105.99 g/mol
Explanation:
Sodium carbonate is the inorganic compound with the formula Na₂CO₃ and its various hydrates. All forms are white, odourless, water-soluble salts that yield alkaline solutions in water.
A mass of 100 g of NaNO3 is dissolved in 100 g of water. At what temperature should solid crystals form?
A mass of 100 g of NaNO3 is dissolved in 100 g of water, at "31.2°C" temperature the solid crystals are form.
When 100 g of NaNO3 is dissolved in 100 g of water, the solution formed is a saturated solution because NaNO3 is an ionic compound, and ionic compounds are soluble in water.
The following is the solubility curve of NaNO3 in water at different temperatures, which shows how much solute (in grams) can dissolve in 100 grams of water at different temperatures, or in other words, the maximum solubility: [tex]\text{NaNO}_{3}\text{ solubility curve}[/tex]We have to identify the temperature at which the solubility curve of NaNO3 intersects the line of 100 g of NaNO3.
The intersection point is at 31.2°C. At this temperature, the solution is saturated, and any additional amount of NaNO3 will result in the formation of solid crystals.
As a result, the temperature at which solid crystals will form is 31.2°C.
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what is the equivalent resistance of this circuit
Answer: 100 ohms.
Explanation:
The circuit is composed of two parallel branches (upper and lower), with one resistor in the upper branch (150) and two resistors in the lower branch (250 and 50).
The lower branch resistors are in series, so the lower branch's resistance is:
250 + 50 = 300.
Now, the upper branch (150) and total lower branch (300) are in parallel, so:
[tex]\frac{1}{R} = \frac{1}{150} + \frac{1}{300}[/tex]
That is,
[tex]\frac{1}{R} = \frac{3}{300} = \frac{1}{100}[/tex],
Solving for R, we find R = 100.
The equivalent resistance of this circuit is 100 ohms.
4. What is the mass of liquid at 30°C that has a density of 23 g ml and the volume shown in the graduated cylinder? (Show your work to receive credit.)
Answer:
To find the mass of the liquid at 30°C, we first need to determine the volume of the liquid shown in the graduated cylinder. We can do this by using the markings on the cylinder to measure the volume.
Once we have the volume, we can use the density of the liquid to calculate the mass. The formula for calculating the mass of an object with known density and volume is:
mass = density x volume
Using the given information, we have:
density = 23 g/mL volume = the volume shown in the graduated cylinder
Explanation:
What is the maximum mass of P2I4 that can be prepared from 7.95 g of P4O6 and 12.48 g of iodine according to the reaction 5P4O6 + 8I2 → 4P2I4 + 3P4O10
The maximum mass of P2I4 that can be prepared is 9.22 grams.
To determine the maximum mass of P2I4 that can be prepared, we need to find the limiting reactant in the given reaction. The limiting reactant is the one that is completely consumed, thus determining the maximum amount of product that can be formed.
Let's calculate the number of moles of each reactant:
P4O6: Given mass = 7.95 g, molar mass = 283.88 g/mol
Number of moles = mass / molar mass = 7.95 g / 283.88 g/mol = 0.028 g/mol
I2: Given mass = 12.48 g, molar mass = 253.8 g/mol
Number of moles = mass / molar mass = 12.48 g / 253.8 g/mol = 0.049 g/mol
Now, let's use the stoichiometry of the reaction to determine the mole ratio between P4O6 and P2I4. From the balanced equation, we can see that the ratio is 5:4.
Since the ratio of P4O6 to P2I4 is 5:4, we can calculate the theoretical yield of P2I4 based on the moles of P4O6.
The number of moles of P2I4 that can be formed from P4O6 = (0.028 mol P4O6) * (4 mol P2I4 / 5 mol P4O6) = 0.0224 mol P2I4
To convert the moles of P2I4 to grams, we can use the molar mass of P2I4:
Molar mass of P2I4 = (2 * atomic mass of P) + (4 * atomic mass of I) = (2 * 30.97 g/mol) + (4 * 126.9 g/mol) = 411.68 g/mol
The maximum mass of P2I4 that can be prepared from the given reactants is:
Mass of P2I4 = (0.0224 mol P2I4) * (411.68 g/mol) = 9.22 g.
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5. Which of the functional groups contain(s) nitrogen?
Explanation:
Functional groups containing nitrogen are amines and amides.
The general formula for amines is:
RNH₂, where R = longer hydrocarbon chain.
The general formula for amides is:
RCONH₂, where R = longer hydrocarbon chain.
See attached diagram for general structural formula.
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Science Question!
Please order by correct order if Answer and please be Real!
Answer:
matter undergoes
chemical changes such as burning and rusting.
physical changes such as evaporating and melting.
matter has
chemical properties such as reacting with oxygen and changing when heated.
physical properties such as luster and volume.
6) A gas that has a volume of 33 liters, a temperature of 24 °C, and an unknown pressure has its
volume increased to 41,000 milIILiters and its temperature decreased to 13 °C. When the
pressure was measured after the change it was determined to be 2.7atm, what was the original
pressure?
The original pressure[P₁] is approximately 0.0848 atm
We can use the combined gas law equation, which relates the initial and final conditions of a gas sample. The combined gas law equation is as follows:
(P₁ × V₁) / (T₁) = (P₂ × V₂) / (T₂)
Given:
V₁ = 33 liters
T₁ = 24 °C = 24 + 273.15 = 297.15 K (converted to Kelvin)
V₂ = 41,000 milliliters = 41 liters (converted to liters)
T₂ = 13 °C = 13 + 273.15 = 286.15 K (converted to Kelvin)
P₂ = 2.7 atm
We need to find P₁, the original pressure.
Plugging in the values into the combined gas law equation:
(P₁ × 33) / (297.15) = (2.7 × 41) / (286.15)
Simplifying the equation:
33P₁ = (2.7 × 41 × 297.15) / (286.15)
33P₁ ≈ 2.804
Dividing both sides by 33:
P₁ ≈ 2.804 / 33
P₁ ≈ 0.0848 atm
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Two reactants combine to form a product in the reaction A + BC. The rate of the
reaction depends on the concentrations of both reactants squared (rate = K[A]²[B]²).
What's the total reaction order of this reaction?
OA) 3
OB) 4
OC) 2
OD) 1
If the pH of a solution is 4.5 and the other pH of another solution is 7.9, what are the solutions for pH, pOH, [H+], and [OH-]?
For the solution with a pH of 7.9:
pH = 7.9
pOH = 14 - pH = 14 - 7.9 = 6.1
[H+] = 10^(-pH) = 10^(-7.9) (in mol/L)
[OH-] = 10^(-pOH) = 10^(-6.1) (in mol/L)
The pH of a solution is a measure of its acidity, while pOH is a measure of its alkalinity. The pH and pOH values are related through the equation pH + pOH = 14.
For the solution with a pH of 4.5:
pH = 4.5
pOH = 14 - pH = 14 - 4.5 = 9.5
[H+] = 10^(-pH) = 10^(-4.5) (in mol/L)
[OH-] = 10^(-pOH) = 10^(-9.5) (in mol/L)
For the solution with a pH of 7.9:
pH = 7.9
pOH = 14 - pH = 14 - 7.9 = 6.1
[H+] = 10^(-pH) = 10^(-7.9) (in mol/L)
[OH-] = 10^(-pOH) = 10^(-6.1) (in mol/L)
Note: The [H+] and [OH-] concentrations can also be calculated using the equation [H+][OH-] = 1 x 10^(-14) at 25°C.
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