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Worksheet: Conjugate Acid–Base Pairs

Q1:

Two aqueous complex ions react according to the equation:

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

  • A [ C u ( H O ) ] 2 4 2 +
  • B [ C u ( H O ) ( O H ) ] 2 3 +
  • C [ A l ( H O ) ( O H ) ] 2 5 2 +
  • D [ A l ( H O ) ] 2 6 3 +

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

  • A [ C u ( H O ) ] 2 4 2 +
  • B [ A l ( H O ) ] 2 6 3 +
  • C [ C u ( H O ) ( O H ) ] 2 3 +
  • D [ A l ( H O ) ( O H ) ] 2 5 2 +

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

  • A [ C u ( H O ) ( O H ) ] 2 3 +
  • B [ A l ( H O ) ] 2 6 3 +
  • C [ C u ( H O ) ] 2 4 2 +
  • D [ A l ( H O ) ( O H ) ] 2 5 2 +

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

  • A [ C u ( H O ) ] 2 4 2 +
  • B [ A l ( H O ) ( O H ) ] 2 5 2 +
  • C [ C u ( H O ) ( O H ) ] 2 3 +
  • D [ A l ( H O ) ] 2 6 3 +

Q2:

H S O 2 4 and C l ions react according to the equation:

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

  • A H C l
  • B C l
  • C H S O 4
  • D H S O 2 4

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

  • A H C l
  • B C l
  • C H S O 2 4
  • D H S O 4

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

  • A C l
  • B H S O 2 4
  • C H C l
  • D H S O 4

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

  • A H C l
  • B H S O 4
  • C H S O 2 4
  • D C l

Q3:

What is the conjugate acid of H O 2 ?

  • A H O 2 2
  • B O H
  • C O 2
  • D H O 3 +

Q4:

In the reaction

which species is a Brønsted-Lowry acid?

  • A S O 4 2
  • B O H
  • C H O 2
  • D H S O 4

which species is the conjugate base of a Brønsted-Lowry acid?

  • A H O 2
  • B O H
  • C H S O 4
  • D S O 4 2

which species is a Brønsted-Lowry base?

  • A O H
  • B H S O 4
  • C S O 4 2
  • D H O 2

which species is the conjugate acid of a Brønsted-Lowry base?

  • A H O 2
  • B S O 4 2
  • C H S O 4
  • D O H

Q5:

For the reaction of mercury(II) chloride and ammonia, which product is a conjugate Lewis base?

  • A H g C l 2
  • B N H 3
  • C H g ( N H ) 3 2
  • D C l

Q6:

What is the conjugate acid of O H ?

  • A H O 2 2
  • B H O 3 +
  • C O 2
  • D H O 2

Q7:

Give the formula and state symbol of the missing compound in the equation:

  • A H S ( ) 2 g
  • B S O ( ) 2 g
  • C H S O ( ) 2 3 a q
  • D S O ( ) 3 2 a q
  • E H S O ( ) 2 4 a q

Q8:

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

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

Q9:

In the equation

H P O 2 4 is the conjugate base. What is the missing term?

  • A P O 4 3
  • B H P O 2 4
  • C H P O 2 3 +
  • D H P O 3 4
  • E H P O 4 2

Q10:

Gastric juice, the digestive fluid produced in the stomach, contains hydrochloric acid, H C l . Milk of magnesia, a suspension of solid M g ( O H ) 2 in an aqueous medium, is sometimes used to neutralize excess stomach acid:

What value of 𝑥 produces a balanced chemical equation?

What is the conjugate acid of M g ( O H ) 2 ?

  • A H O 2
  • B H C l
  • C M g 2 +
  • D C l
  • E M g C l 2

Q11:

In the equation

N H 3 is the conjugate acid. What is the missing term?

  • A N H 2 4
  • B N H 3
  • C N H 4 +
  • D N H 2

Q12:

What is the conjugate acid of H S ?

  • A S O 2
  • B S 2
  • C H S 2

Q13:

In the equation N H 3 is the conjugate base. What is the missing term?

  • A N H 2 4
  • B N H 3
  • C N H 2
  • D N H 4 +