# Worksheet: Conjugate Acid–Base Pairs

In this worksheet, we will practice identifying conjugate acids and bases in chemical equations and predicting their relative acid or base strengths.

**Q1: **

In the equation shown, is the conjugate acid. What is the missing term?

- A
- B
- C
- D

**Q2: **

Give the formula and state the symbol of the missing compound in the given equation.

- A
- B
- C
- D
- E

**Q3: **

In the given equation, is the conjugate base. What is the missing term?

- A
- B
- C
- D
- E

**Q7: **

In the equation shown, is the conjugate base. What is the missing term?

- A
- B
- C
- D

**Q8: **

and ions react according to the equation shown.

Which species is the Brønsted–Lowry acid in this reaction?

- A
- B
- C
- D

Which species is the conjugate base of the Brønsted–Lowry acid in this reaction?

- A
- B
- C
- D

Which species is the Brønsted–Lowry base in this reaction?

- A
- B
- C
- D

Which species is the conjugate acid of the Brønsted–Lowry base in this reaction?

- A
- B
- C
- D

**Q9: **

Consider the reaction shown and then answer the following questions.

Which species is a Brønsted–Lowry acid?

- A
- B
- C
- D

Which species is the conjugate base of a Brønsted–Lowry acid?

- A
- B
- C
- D

Which species is a Brønsted–Lowry base?

- A
- B
- C
- D

Which species is the conjugate acid of a Brønsted–Lowry base?

- A
- B
- C
- D

**Q10: **

Two aqueous complex ions react according to the equation shown.

Which species is the Brønsted–Lowry acid in this reaction?

- A
- B
- C
- D

Which species is the conjugate base of the Brønsted–Lowry acid in this reaction?

- A
- B
- C
- D

Which species is the Brønsted–Lowry base in this reaction?

- A
- B
- C
- D

Which species is the conjugate acid of the Brønsted–Lowry base in this reaction?

- A
- B
- C
- D

**Q12: **

Gastric juice, the digestive fluid produced in the stomach, contains hydrochloric acid, . Milk of magnesia, a suspension of solid in an aqueous medium, is sometimes used to neutralize excess stomach acid.

What value of produces a balanced chemical equation?

What is the conjugate acid of ?

- A
- B
- C
- D
- E

**Q13: **

Why does the complete reaction of a weak acid with a strong base produce a basic solution?

- AAn excess of strong base must be used for the reaction to reach completion.
- BThe reaction produces a weak conjugate base and no conjugate acid.
- CThe reaction produces a strong conjugate base and a weak conjugate acid.
- DThe reaction produces ions that interact strongly with hydroxide ions in solution, stabilizing their negative charge.
- EWater competes with the weak acid to react with the base, raising the concentration of hydroxide ions.

**Q17: **

In the shown equation, is the conjugate base. What is the missing term?

- A
- B
- C
- D

**Q23: **

In the shown equation, is the conjugate acid. What is the missing term?

- A
- B
- C
- D
- E