Q: Calculate the $$[\mathrm{OH^-}] in a $$solution where $$[\mathrm{H_3O^+}] = 1.0 \times 10$$^{-3}$$\ \mathrm{M} at$$ $$25^\circ\mathrm{C}$$. ($$K_w = 1.0 \times 10$$^{-14}$$)

$$1.0 \times 10$$^{-11}$$\ \mathrm{M}$$

Q: Which of the following acids is the strongest, based on their $$K_a$$ values?

Chlorous acid ($$K_a = 1.1 \times 10$$^{-2}$$)

Q: A solution is prepared by dissolving $$0.10\ \mathrm{M}$$ acetic acid ($$K_a = 1.8 \times 10$$^{-5}$$) in water. Which of the following is closest to the $$[\mathrm{H_3O^+}]$$ at equilibrium?

$$1.3 \times 10$$^{-4}$$\ \mathrm{M}$$

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 dissociates completely in water, while a weak acid dissociates only partially.

Question 2

Which of the following household substances is most likely to have a pH greater than 7?

Accepted Answer

Oven cleaner (contains NaOH)

Question 3

Given the following reaction: $$\mathrm{NH_3$(aq) + H_2O(l) \rightleftharpoons NH_4$^+(aq) + OH^-(aq)}$$, which species is acting as the Brønsted-Lowry base?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 4

A solution has $$[\mathrm{H_3O^+}] = 2.0 	imes 10$$^{-5}$$\ \mathrm{M} at$$ $$25^\circ\mathrm{C}. $$What is the pH of the solution?

Accepted Answer

$$4.70$$

Question 5

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

Accepted Answer

Sodium acetate ($$\mathrm{CH_3COONa})$$

Question 6

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

Accepted Answer

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

Question 7

Calculate the $$[\mathrm{OH^-}] in a $$solution where $$[\mathrm{H_3O^+}] = 1.0 	imes 10$$^{-3}$$\ \mathrm{M} at$$ $$25^\circ\mathrm{C}$$. ($$K_w = 1.0 	imes 10$$^{-14}$$)

Accepted Answer

$$1.0 	imes 10$$^{-11}$$\ \mathrm{M}$$

Question 8

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

Accepted Answer

$$\mathrm{$$HCO_3$$^-}$$ / $$\mathrm{CO_3$^{2-}}$$

Question 9

Which of the following acids is the strongest, based on their $$K_a$$ values?

Accepted Answer

Chlorous acid ($$K_a = 1.1 	imes 10$$^{-2}$$)

Question 10

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

Accepted Answer

The H–F bond is much stronger than the H–Cl bond, making HF less likely to dissociate.

Question 11

A solution is prepared by dissolving $$0.10\ \mathrm{M}$$ acetic acid ($$K_a = 1.8 	imes 10$$^{-5}$$) in water. Which of the following is closest to the $$[\mathrm{H_3O^+}]$$ at equilibrium?

Accepted Answer

$$1.3 	imes 10$$^{-4}$$\ \mathrm{M}$$

Question 12

Which of the following best describes the leveling effect in water?

Accepted Answer

All strong acids appear equally strong in water because they completely dissociate to form $$\mathrm{H_3O^+}.$$

Question 13

Which of the following is a Lewis acid in the reaction $$\mathrm{BF_3$} + \mathrm{NH_3$} \rightarrow \mathrm{F_3B-NH_3$}$$?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 14

Which of the following factors increases the acidity of an oxoacid?

Accepted Answer

Increasing the number of oxygen atoms bonded to the central atom

Question 15

A solution of $$0.10\ \mathrm{M}$$ propanoic acid ($$K_a = 1.3 	imes 10$$^{-5}$$) is prepared. What is the percent dissociation of the acid?

Accepted Answer

$$1.1\%$$

Question 16

Which of the following best describes why a solution of $$\mathrm{Fe(NO_3$)_3} is $$acidic?

Accepted Answer

The $$\mathrm{Fe$$^{3+}$$}$$ ion is small and highly charged, polarizing water molecules and releasing $$\mathrm{H^+}.$$

Question 17

Which of the following is the correct relationship between $$K_a$$, $$K_b$$, and $$K_w$$ for a conjugate acid-base pair?

Accepted Answer

$$K_a 	imes K_b = K_w$$

Question 18

Which of the following is NOT a property of acids?

Accepted Answer

Bitter taste

Acid-Base Equilibria: Structure, Properties, and Calculations

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