Q: A solution has a pH of 5. What is the $[H^+]$ concentration in the solution?

$[H^+] = 1 \times 10^{-5}\ \text{M}$

Q: If the pOH of a solution is 3, what is the $[OH^-]$ concentration?

$[OH^-] = 1 \times 10^{-3}\ \text{M}$

Q: A solution has a pH of 4. What is the $[OH^-]$ concentration?

$[OH^-] = 1 \times 10^{-10}\ \text{M}$

Q: A solution is prepared by dissolving a base in water, resulting in a pH of 10. What is the $[OH^-]$ concentration?

$[OH^-] = 1 \times 10^{-4}\ \text{M}$

Q: Which of the following is the correct relationship for the ion product constant of water ($K_w$) at 25°C?

$K_w = [H^+][OH^-] = 1.0 \times 10^{-14}$

Q: If a solution has a pH of 9, what is the $[H^+]$ concentration?

$[H^+] = 1 \times 10^{-9}\ \text{M}$

Question 1

Which of the following correctly expresses the relationship between pH and the concentration of hydrogen ions $[H^+]$ in a solution?

Accepted Answer

$	ext{pH} = -\log[H^+]$

Question 2

A solution has a pH of 5. What is the $[H^+]$ concentration in the solution?

Accepted Answer

$[H^+] = 1 	imes 10^{-5}\ 	ext{M}$

Question 3

If the pOH of a solution is 3, what is the $[OH^-]$ concentration?

Accepted Answer

$[OH^-] = 1 	imes 10^{-3}\ 	ext{M}$

Question 4

Which of the following statements is true about a neutral aqueous solution at 25°C?

Accepted Answer

The concentration of $[H^+]$ is equal to the concentration of $[OH^-]$.

Question 5

A solution has a pH of 8. What is the pOH of the solution at 25°C?

Accepted Answer

$	ext{pOH} = 6$

Question 6

If the $[OH^-]$ in a solution is $2.5 	imes 10^{-5}\ 	ext{M}$, what is the pOH?

Accepted Answer

$	ext{pOH} = 4.60$

Question 7

A solution has a pH of 4. What is the $[OH^-]$ concentration?

Accepted Answer

$[OH^-] = 1 	imes 10^{-10}\ 	ext{M}$

Question 8

Which of the following best describes a solution with a pH of 2?

Accepted Answer

It is acidic and has a high $[H^+]$ concentration.

Question 9

If the pH of a solution is 6.12, what is the pOH?

Accepted Answer

$	ext{pOH} = 7.88$

Question 10

A sample of pure water at 20°C has a pH of 7.083. What is the value of $K_w$ at this temperature?

Accepted Answer

$K_w = 6.82 	imes 10^{-15}$

Question 11

A solution is prepared by dissolving a base in water, resulting in a pH of 10. What is the $[OH^-]$ concentration?

Accepted Answer

$[OH^-] = 1 	imes 10^{-4}\ 	ext{M}$

Question 12

Which of the following is true for an acidic solution at 25°C?

Accepted Answer

The $[H^+]$ is greater than $[OH^-]$.

Question 13

If the pH of a solution decreases from 7 to 5, what happens to the $[H^+]$ concentration?

Accepted Answer

It increases by a factor of 100.

Question 14

A solution has a pOH of 12. What is the pH of the solution at 25°C?

Accepted Answer

$	ext{pH} = 2$

Question 15

Which of the following is the correct relationship for the ion product constant of water ($K_w$) at 25°C?

Accepted Answer

$K_w = [H^+][OH^-] = 1.0 	imes 10^{-14}$

Question 16

A solution has $[H^+] = 3.2 	imes 10^{-4}\ 	ext{M}$. What is the pH?

Accepted Answer

$	ext{pH} = 3.49$

Question 17

If a solution has a pH of 9, what is the $[H^+]$ concentration?

Accepted Answer

$[H^+] = 1 	imes 10^{-9}\ 	ext{M}$

Question 18

A solution has a pH of 11.88. What is the $[OH^-]$ concentration?

Accepted Answer

$[OH^-] = 7.6 	imes 10^{-3}\ 	ext{M}$

Acids, Bases, and the pH Scale: Calculations and Relationships

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