Question 1

According to the Brønsted-Lowry definition, which of the following best describes a base?

Accepted Answer

A substance that accepts a proton ($$H^+)$$

Question 2

Which of the following pairs are always found together in a Brønsted-Lowry acid/base reaction?

Accepted Answer

Conjugate acid and conjugate base

Question 3

In the reaction $$HF	ext{ (aq)} + H_2O	ext{ (l)} \rightarrow F^-	ext{ (aq)} + H_3O^+	ext{ (aq)}$$, which species acts as the Brønsted-Lowry acid?

Accepted Answer

$$HF$$

Question 4

What is the conjugate base of $$HSO_4$$^-$$?

Accepted Answer

$$SO_4$$^{2-}$$

Question 5

Which of the following is a Brønsted-Lowry acid?

Accepted Answer

$$HCN$$

Question 6

In the reaction $$CN^-	ext{ (aq)} + H_2O	ext{ (l)} \rightarrow HCN	ext{ (aq)} + OH^-	ext{ (aq)}$$, what is the conjugate acid?

Accepted Answer

$$HCN$$

Question 7

Which of the following statements is TRUE about Brønsted-Lowry acids and bases?

Accepted Answer

They always form conjugate acid/base pairs in reactions.

Question 8

What is the conjugate acid of $$NH_2NH_2$$?

Accepted Answer

$$NH_2NH_3^+$$

Question 9

Which of the following best describes the role of $$H_2O in $$the reaction $$CO_3$$^{2-}	ext{ (aq)} + H_2O	ext{ (l)} \rightarrow $$HCO_3^-	$$ext{ (aq)} + OH^-	ext{ (aq)}$$?

Accepted Answer

It acts as a Brønsted-Lowry acid.

Question 10

If $$H_2SO_4$$ donates a proton, what is the resulting conjugate base?

Accepted Answer

$$HSO_4$$^-$$

Question 11

Which of the following reactions demonstrates the Brønsted-Lowry concept of acid-base pairs?

Accepted Answer

$$NH_3 + H_2O$$ \rightarrow $$NH_4^+ + OH$$^-$$

Question 12

In the reaction $$HS^-	ext{ (aq)} \rightarrow S$$^{2-}$$	ext{ (aq)} + H^+$$, what is $$S^{2-} in $$relation to $$HS^-$$?

Accepted Answer

Conjugate base

Question 13

Which of the following is the correct chemical equation for the reaction of carbonate ion with water?

Accepted Answer

$$CO_3$$^{2-}	ext{ (aq)} + H_2O	ext{ (l)} \rightarrow $$HCO_3^-	$$ext{ (aq)} + OH^-	ext{ (aq)}$$

Question 14

Which of the following is the conjugate acid of $$VO_2$$^-$$?

Accepted Answer

$$HVO_2$$

Question 15

In the reaction $$HCN	ext{ (aq)} + OH^-	ext{ (aq)} \rightarrow CN^-	ext{ (aq)} + H_2O	ext{ (l)}$$, which species is the conjugate base?

Accepted Answer

$$CN^-$$

Question 16

Which of the following is NOT a characteristic of Brønsted-Lowry acids?

Accepted Answer

They must contain oxygen

Question 17

A student mixes $$NH_3$$ and $$H_2O in a $$beaker. Which species acts as the Brønsted-Lowry base?

Accepted Answer

$$NH_3$$

Question 18

Which of the following best explains why $$SO_4$$^{2-}$$ is the conjugate base of $$HSO_4$$^-$$?

Accepted Answer

It is formed by removing a proton ($$H^+) $$from $$HSO_4$$^-$$

Question 19

Which of the following is the correct definition of a conjugate acid?

Accepted Answer

A species formed when a base gains a proton ($$H^+)$$

Bronsted-Lowry Acids and Bases: Definitions, Conjugate Pairs, and Applications

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