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 $$2.3 at$$ $$25^\circC. $$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 $$25^\circC $$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 $$[\mathrm{OH}^-] at$$ $$25^\circC$$?

$$1.0 \times 10$$^{-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 ($$25^\circC$$, $$1 M $$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 $$25^\circC$$?

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 $$25^\circC$$?

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 $$2.3 at$$ $$25^\circC. $$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 $$25^\circC $$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 $$25^\circC$$?

Accepted Answer

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

Question 13

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

Accepted Answer

$$9.0$$

Question 14

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

Accepted Answer

pH $$\u003e 7$$ and $$[\mathrm{OH}^-] \u003e [\mathrm{H}^+]$$

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

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

The pH Scale and Acid-Base Calculations

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