$$[\mathrm{H_3O^+}] = [\mathrm{OH^-}] = 1.0 \times 10$$^{-7}$$ M

HCN, $$K_a = 4.9 \times 10$$^{-10}$$

Question 1

Which of the following statements best describes the Arrhenius definition of an acid?

Accepted Answer

A substance that produces H$$^+$$ ions in aqueous solution.

Question 2

Hydrochloric acid (HCl) is added to water. Which equation correctly represents its dissociation?

Accepted Answer

$$\mathrm{HCl(aq) \rightarrow H^+(aq) + Cl^-(aq)}$$

Question 3

Which of the following is an example of a Bronsted-Lowry base?

Accepted Answer

NH$$_3$$

Question 4

A solution has a pH of 4.48. What is the concentration of hydronium ions, $$[\mathrm{H_3O^+}]$$, in this solution?

Accepted Answer

$$3.3 	imes 10$$^{-5}$$ M

Question 5

Which of the following species is amphoteric?

Accepted Answer

HCO$$_3^-$$

Question 6

Which of the following acids is considered a strong acid?

Accepted Answer

HNO$$_3$$

Question 7

What is the pH of a 2.0 $$	imes 10$^{-2} M $$solution of HNO$$_3 (a $$strong acid)?

Accepted Answer

1.70

Question 8

Which of the following salts will form a basic solution in water?

Accepted Answer

NaF

Question 9

A 0.10 M solution of acetic acid (CH$$_3$$COOH) has a pH of 2.87. What is the percent ionization of acetic acid in this solution?

Accepted Answer

1.35%

Question 10

Which of the following is the correct relationship between pH and pOH in aqueous solution at 25$$^\circC$$?

Accepted Answer

$$\mathrm{pH + pOH = 14.00}$$

Question 11

Which of the following is the strongest acid?

Accepted Answer

HClO$$_4$$

Question 12

Which of the following statements is TRUE regarding a neutral aqueous solution at 25$$^\circC$$?

Accepted Answer

$$[\mathrm{H_3O^+}] = [\mathrm{OH^-}] = 1.0 	imes 10$$^{-7}$$ M

Question 13

Which of the following is a Lewis acid?

Accepted Answer

BF$$_3$$

Question 14

A student mixes 0.10 M HCl (strong acid) and 0.10 M CH$$_3$$COOH (weak acid) in water. Which statement is correct about the resulting solution?

Accepted Answer

The pH is determined almost entirely by the strong acid, HCl.

Question 15

Which of the following cations will produce an acidic solution when dissolved in water?

Accepted Answer

NH$$_4^+$$

Question 16

What is the pH of a 3.45 $$	imes 10$^{-3} M $$LiOH solution?

Accepted Answer

11.54

Question 17

Which of the following is NOT a conjugate acid-base pair?

Accepted Answer

OH$$^- / NH$_3$$

Question 18

Which of the following solutions would have the highest pH? Each is 0.10 M in acid at 25$$^\circC.$$

Accepted Answer

HCN, $$K_a = 4.9 	imes 10$$^{-10}$$

Question 19

Which of the following is the correct formula for calculating percent ionization of a weak acid?

Accepted Answer

$$\mathrm{\%\ ionization = \frac{[H_3O^+]_{eq}}{[HA]_{initial}} 	imes 100}$$

Acids and Bases: Fundamental Concepts and Properties

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