Worksheet: Buffer Solutions

In this worksheet, we will practice describing the procedure for preparing buffer solutions, selecting suitable glassware, and troubleshooting errors.

Q1:

Which acid in the table is most appropriate for the preparation of a buffer solution with a pH of 3.1?

Ionization Reaction H S O + H O H O + S O 4 2 3 + 4 2 H F + H O H O + F 2 3 + H N O + H O H O + N O 2 2 3 + 2 H C N O + H O H O + C N O 2 3 + C H C O H + H O H O + C H C O 3 2 2 3 + 3 2
𝐾 a at 25C 1 . 2 × 1 0 6 . 8 × 1 0 4 . 6 × 1 0 2 × 1 0 1 . 8 × 1 0
  • A H N O 2
  • B H S O 4
  • C C H C O H 3 2
  • D H C N O
  • E H F

Q2:

Which base in the table is most appropriate for the preparation of a buffer solution with a pH of 9.28?

Ionization Reaction ( C H ) N H + H O ( C H ) N H + O H 3 2 2 3 2 2 + C H N H + H O C H N H + O H 3 2 2 3 3 + ( C H ) N + H O ( C H ) N H + O H 3 3 2 3 3 + N H + H O N H + O H 3 2 4 + C H N H + H O C H N H + O H 6 5 2 2 6 5 3 +
𝐾 b at 25C 5 . 9 × 1 0 4 . 4 × 1 0 6 . 3 × 1 0 1 . 8 × 1 0 4 . 3 × 1 0
  • A N H 3
  • B C H N H 3 2
  • C ( C H ) N 3 3
  • D ( C H ) N H 3 2
  • E C H N H 6 5 2

Q3:

Which base in the table is most appropriate for the preparation of a buffer solution with a pH of 10.65?

Ionization Reaction ( C H ) N H + H O ( C H ) N H + O H 3 2 2 3 2 2 + C H N H + H O C H N H + O H 3 2 2 3 3 + ( C H ) N + H O ( C H ) N H + O H 3 3 2 3 3 + N H + H O N H + O H 3 2 4 + C H N H + H O C H N H + O H 6 5 2 2 6 5 3 +
𝐾 b at 25C 5 . 9 × 1 0 4 . 4 × 1 0 6 . 3 × 1 0 1 . 8 × 1 0 4 . 3 × 1 0
  • A ( C H ) N H 3 2
  • B C H N H 3 2
  • C C H N H 6 5 2
  • D N H 3
  • E ( C H ) N 3 3

Q4:

Which acid in the table is most appropriate for the preparation of a buffer solution with a pH of 4.5?

Ionization Reaction H F + H O H O + F 2 3 + H C O H + H O H O + H C O 2 2 3 + 2 C H C O H + H O H O + C H C O 3 2 2 3 + 3 2 H C l O + H O H O + C l O 2 3 + H B r O + H O H O + B r O 2 3 +
𝐾 a at 25C 6 . 8 × 1 0 1 . 8 × 1 0 1 . 8 × 1 0 2 . 9 × 1 0 2 . 8 × 1 0
  • A H B r O
  • B H F
  • C C H C O H 3 2
  • D H C O H 2
  • E H C l O

Q5:

Which one of the following pairs can be mixed to make a buffer solution?

  • A H C l , N a O H
  • B N H C l 4 , N a O H
  • C N H C l 4 , N a C l
  • D C H C O O H 3 , H C l
  • E N H 3 , N a O H

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