Q: A solution has a pH of 3.0. What is the $$[\mathrm{H_3O^+}]$$ concentration?

$$1.0 \times 10$$^{-3}$$\ \mathrm{M}$$

Q: A 0.15 M acetic acid solution has $$K_a = 1.8 \times 10$$^{-5}$$. What is the equilibrium concentration of H_3O$$^+$$, assuming x$ is negligible?

$$1.6 \times 10$$^{-3}$$\ \mathrm{M}$$

Question 1

Which of the following best describes a Lewis acid?

Accepted Answer

A substance that accepts an electron pair

Question 2

According to the Brønsted-Lowry definition, which species acts as the base in the following reaction? $$\mathrm{HCl(aq) + H_2O(l) \rightarrow H_3O^+(aq) + Cl^-(aq)}$$

Accepted Answer

$$\mathrm{H_2O}$$

Question 3

A solution has a pH of 3.0. What is the $$[\mathrm{H_3O^+}]$$ concentration?

Accepted Answer

$$1.0 	imes 10$$^{-3}$$\ \mathrm{M}$$

Question 4

Which of the following statements about the autoionization of water is correct?

Accepted Answer

The process produces equal concentrations of $$\mathrm{H_3O^+}$$ and $$\mathrm{OH^-}.$$

Question 5

A 0.10 M solution of HCl has a pH of 1.00. What does this indicate about HCl?

Accepted Answer

HCl is a strong acid and completely ionizes.

Question 6

Which of the following is the correct expression for the acid dissociation constant ($$K_a) $$for a generic weak acid $$HA$$?

Accepted Answer

$$K_a = \dfrac{[H^+][A^-]}{[HA]}$$

Question 7

If the $$K_a of $$acetic acid is $$1.8 	imes 10$$^{-5}$$, what is its pK_a$?

Accepted Answer

$$pK_a = 4.74$$

Question 8

A student dilutes a weak acid solution. What happens to the percent ionization?

Accepted Answer

It increases.

Question 9

Which of the following is true for a solution with $$[OH^-] = 1.0 	imes 10$$^{-6}$$\ \mathrm{M} at 25$$°C?

Accepted Answer

The solution is basic and $$pOH = 6.00$$

Question 10

Which of the following is a conjugate acid-base pair?

Accepted Answer

$$\mathrm{H_2O}$$ and $$\mathrm{OH^-}$$

Question 11

A solution has a $$pOH of 3.54 at 25$$°C. What is its pH?

Accepted Answer

$$pH = 10.46$$

Question 12

Which of the following is NOT a property of an Arrhenius base?

Accepted Answer

Accepts an electron pair

Question 13

Which of the following best explains why $$H^+$$ ions do not exist freely in aqueous solution?

Accepted Answer

They immediately bond to water molecules to form $$H_3O^+.$$

Question 14

A 0.15 M acetic acid solution has $$K_a = 1.8 	imes 10$$^{-5}$$. What is the equilibrium concentration of H_3O$$^+$$, assuming x$ is negligible?

Accepted Answer

$$1.6 	imes 10$$^{-3}$$\ \mathrm{M}$$

Question 15

Which of the following is the correct relationship at 25°C?

Accepted Answer

$$pH + pOH = 14.00$$

Question 16

Which of the following is a real-world application of the concept of pH?

Accepted Answer

Determining the acidity of rainwater to assess environmental pollution

Question 17

Which of the following statements about weak acids is correct?

Accepted Answer

They have a low $$K_a$$ value and only partially ionize.

Question 18

If a solution has $$[H^+] = 2.0 	imes 10$$^{-5}$$\ \mathrm{M}$$, what is its pH?

Accepted Answer

$$pH = 4.70$$

Question 19

Which of the following best describes an amphoteric substance?

Accepted Answer

A substance that can act as either an acid or a base depending on the reaction partner

Chapter 17: Acids and Bases – General Chemistry II Study Notes

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