Q: A solution has a pH of $3.0$. What is the concentration of hydrogen ions $[\mathrm{H}^+]$ in the solution?

$[\mathrm{H}^+] = 1 \times 10^{-3}\ \mathrm{M}$

Q: A solution is prepared by dissolving HCN in $2$ L of water. The pH is found to be $3.24$. What is the $[\mathrm{H}^+]$ of this solution?

$5.8 \times 10^{-4}\ \mathrm{M}$

Q: A solution of NaOH was analyzed in a chemistry lab and the pOH was determined to be $9.3$. What is the concentration of $[\mathrm{OH}^-]$ in the solution?

$5.0 \times 10^{-10}\ \mathrm{M}$

Q: You prepare a solution of HCl with a pH of $2.3$ at $25^\circ$C. What would be the pOH and the concentration of hydroxide ions $[\mathrm{OH}^-]$?

pOH $= 11.7$, $[\mathrm{OH}^-] = 2.0 \times 10^{-12}\ \mathrm{M}$

Q: A lemon juice solution at $25^\circ$C has a pH of $2.5$. What is the $[\mathrm{H}^+]$?

$3.2 \times 10^{-3}\ \mathrm{M}$

Q: A solution has a pH of $5.0$. What is the $[\mathrm{OH}^-]$ at $25^\circ$C?

$1.0 \times 10^{-9}\ \mathrm{M}$

Question 1

Which of the following statements about the pH scale is correct?

Accepted Answer

The pH scale ranges from $0$ to $14$ under normal conditions ($25^\circ$C, $1$ M solutions).

Question 2

A solution has a pH of $3.0$. What is the concentration of hydrogen ions $[\mathrm{H}^+]$ in the solution?

Accepted Answer

$[\mathrm{H}^+] = 1 	imes 10^{-3}\ \mathrm{M}$

Question 3

If the pH of a solution is $9.0$, what is its pOH at $25^\circ$C?

Accepted Answer

$5.0$

Question 4

Which solution is the most acidic?

Accepted Answer

A solution with pH $1.2$

Question 5

A solution is prepared by dissolving HCN in $2$ L of water. The pH is found to be $3.24$. What is the $[\mathrm{H}^+]$ of this solution?

Accepted Answer

$5.8 	imes 10^{-4}\ \mathrm{M}$

Question 6

If the pOH of a solution is $2.5$, what is the pH at $25^\circ$C?

Accepted Answer

$11.5$

Question 7

A solution of NaOH was analyzed in a chemistry lab and the pOH was determined to be $9.3$. What is the concentration of $[\mathrm{OH}^-]$ in the solution?

Accepted Answer

$5.0 	imes 10^{-10}\ \mathrm{M}$

Question 8

You prepare a solution of HCl with a pH of $2.3$ at $25^\circ$C. What would be the pOH and the concentration of hydroxide ions $[\mathrm{OH}^-]$?

Accepted Answer

pOH $= 11.7$, $[\mathrm{OH}^-] = 2.0 	imes 10^{-12}\ \mathrm{M}$

Question 9

A $345$ mL bottle of antacid (Mg(OH)$_2$) contains $1.43 	imes 10^{-2}$ moles of hydroxide ions. What is the pOH of the antacid?

Accepted Answer

$1.38$

Question 10

Which of the following statements about aqueous solutions is correct?

Accepted Answer

As the concentration of hydrogen ions increases, the concentration of hydroxide ions decreases.

Question 11

A lemon juice solution at $25^\circ$C has a pH of $2.5$. What is the $[\mathrm{H}^+]$?

Accepted Answer

$3.2 	imes 10^{-3}\ \mathrm{M}$

Question 12

Which of the following best describes a neutral solution at $25^\circ$C?

Accepted Answer

pH $= 7$, $[\mathrm{H}^+] = [\mathrm{OH}^-]$

Question 13

If a solution has $[\mathrm{OH}^-] = 1 	imes 10^{-5}\ \mathrm{M}$ at $25^\circ$C, what is its pH?

Accepted Answer

$9.0$

Question 14

Which of the following is true for a basic solution at $25^\circ$C?

Accepted Answer

pH $> 7$ and $[\mathrm{OH}^-] > [\mathrm{H}^+]$

Question 15

A solution has a pH of $5.0$. What is the $[\mathrm{OH}^-]$ at $25^\circ$C?

Accepted Answer

$1.0 	imes 10^{-9}\ \mathrm{M}$

Question 16

Which of the following is the correct formula relating pH and pOH at $25^\circ$C?

Accepted Answer

$\mathrm{pH} + \mathrm{pOH} = 14$

The pH Scale and Acid-Base Calculations

Study Guide - Practice Questions

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