Question 1

Which of the following statements best describes the difference between a strong acid and a weak acid in aqueous solution?

Accepted Answer

A strong acid ionizes completely in water, while a weak acid only partially ionizes.

Question 2

Which of the following is the correct expression for the acid ionization constant ($$K_a) $$for the generic acid $$HA in $$water?

Accepted Answer

$$K_a = \frac{[H_3O^+][A^-]}{[HA]}$$

Question 3

A solution has $$[H_3O^+] = 1.0 	imes 10$$^{-5}$$ M at 25°C. What is the pH of this solution?

Accepted Answer

pH = 5.00

Question 4

Which of the following household products is most likely to contain a strong base?

Accepted Answer

Drain cleaner

Question 5

Which of the following is an example of an amphoteric substance?

Accepted Answer

Water ($$H_2O)$$

Question 6

Given $$K_w = 1.0 	imes 10$$^{-14}$$ at 25°C, what is the $$[OH^-]$$ in a solution where $$[H_3O^+] = 2.0 	imes $$10^{-4} M$$?

Accepted Answer

$$5.0 	imes 10$$^{-11}$$ M

Question 7

Which of the following salts will produce a basic solution when dissolved in water?

Accepted Answer

NaF

Question 8

Which of the following acids is stronger based on the number of oxygen atoms present?

Accepted Answer

Sulfuric acid ($$H_2SO_4)$$

Question 9

Which of the following best describes a Lewis acid?

Accepted Answer

An electron pair acceptor

Question 10

A 0.10 M solution of a weak acid $$HA$$ has a $$[H_3O^+] of$$ $$1.3 	imes 10$$^{-3}$$ M. What is the percent ionization?

Accepted Answer

1.3%

Question 11

Which of the following is the conjugate base of $$H_2PO_4^-$$?

Accepted Answer

$$HPO_4$$^{2-}$$

Question 12

Which of the following best explains why acid rain is harmful to limestone buildings?

Accepted Answer

Acids react with carbonates in limestone, causing degradation.

Question 13

Which of the following equations correctly represents the autoionization of water?

Accepted Answer

$$2H_2O(l) \rightleftharpoons H_3O^+(aq) + OH^-(aq)$$

Question 14

Which of the following is true about the relationship between $$K_a$$ and $$K_b$$ for a conjugate acid-base pair?

Accepted Answer

$$K_a 	imes K_b = K_w$$

Question 15

A solution is prepared by dissolving $$0.10$$ mol of $$NaOH in$$ $$1.0 L of $$water. What is the pH of the solution?

Accepted Answer

pH = 13.00

Question 16

Which of the following is a property of bases?

Accepted Answer

They feel slippery.

Question 17

Which of the following best describes the effect of increasing the initial concentration of a weak acid on its percent ionization?

Accepted Answer

Percent ionization decreases.

Question 18

Which of the following is a Lewis base?

Accepted Answer

H_2O

Question 19

Which of the following best explains why $$HF is a $$weak acid while $$HCl is a $$strong acid?

Accepted Answer

$$HF$$ has a stronger H–F bond, making it less likely to ionize.

Question 20

Which of the following best describes the pH of a solution containing $$NH_4Cl$$?

Accepted Answer

Acidic

Acids and Bases: Properties, Definitions, and Calculations

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