Question 1

Which of the following statements best describes a strong acid?

Accepted Answer

A strong acid completely dissociates in water and donates a proton ($\mathrm{H^+}$) easily.

Question 2

Which of the following is a strong base?

Accepted Answer

Potassium hydroxide ($\mathrm{KOH}$)

Question 3

A weak acid:

Accepted Answer

Partially dissociates in water and donates a proton less readily.

Question 4

Which of the following pairs correctly matches the acid/base with its strength?

Accepted Answer

$\mathrm{HCN}$: weak acid, $\mathrm{Ba(OH)_2}$: strong base

Question 5

Which of the following aqueous solutions will contain mostly reactants at equilibrium?

Accepted Answer

$\mathrm{NH_3}$

Question 6

What is the relationship between the strength of an acid and the strength of its conjugate base?

Accepted Answer

There is an inverse relationship; strong acids have weak conjugate bases.

Question 7

Which of the following acids has a relatively strong conjugate base?

Accepted Answer

$\mathrm{HCN}$

Question 8

Which of the following bases will have the weakest conjugate acid?

Accepted Answer

$\mathrm{C_6H_5NH_2}$

Question 9

Given the following reaction: $\mathrm{HC_2H_3O_2~(aq) + H_2O~(l) \rightleftharpoons H_3O^+~(aq) + C_2H_3O_2^-~(aq)}$, predict the direction of the equilibrium.

Accepted Answer

The reaction favors reactants.

Question 10

Which of the following solutions will have the lowest $[OH^-]$ concentration?

Accepted Answer

$0.25~\mathrm{M~NH_3}$

Question 11

Which of the following is a weak base?

Accepted Answer

$\mathrm{NH_3}$

Question 12

Which of the following is a strong acid?

Accepted Answer

$\mathrm{HClO_4}$

Question 13

A solution of $\mathrm{0.25~M~NH_3}$ will have a lower $[OH^-]$ than which of the following?

Accepted Answer

$\mathrm{1.25~M~KOH}$

Question 14

Which of the following best explains why strong acids are strong electrolytes?

Accepted Answer

They completely dissociate in water, producing many ions.

Question 15

Which of the following is true about weak bases?

Accepted Answer

They only partially ionize in water and favor reactants.

Question 16

Which of the following is the strongest base?

Accepted Answer

$\mathrm{Cl^-}$

Question 17

Which of the following acids will have the weakest conjugate base?

Accepted Answer

$\mathrm{HClO_4}$

Question 18

Which of the following is a real-world application of strong acids?

Accepted Answer

Hydrochloric acid ($\mathrm{HCl}$) is used in stomach digestion.

Question 19

Which of the following statements is true regarding the direction of acid-base reactions?

Accepted Answer

Reactions involving strong acids and bases favor products.

Strong and Weak Acids & Bases: Properties, Conjugates, and Examples

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