# Worksheet: Buffer Solutions

Q1:

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

 Ionization Reaction 𝐾 b at 2 5 ∘ C ( 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 + – 5 . 9 × 1 0 − 4 4 . 4 × 1 0 − 4 6 . 3 × 1 0 − 5 1 . 8 × 1 0 − 5 4 . 3 × 1 0 − 1 0
• A
• B
• C
• D
• E

Q2:

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

 Ionization Reaction 𝐾 b at 2 5 ∘ C ( 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 + – 5 . 9 × 1 0 − 4 4 . 4 × 1 0 − 4 6 . 3 × 1 0 − 5 1 . 8 × 1 0 − 5 4 . 3 × 1 0 − 1 0
• A
• B
• C
• D
• E

Q3:

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

 Ionization Reaction 𝐾 a at 2 5 ∘ C 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 + N C O 2 3 + – C H C O H + H O H O + C H C O 3 2 2 3 + 3 2 – 1 . 2 × 1 0 − 2 6 . 8 × 1 0 − 4 4 . 6 × 1 0 − 4 2 × 1 0 − 4 1 . 8 × 1 0 − 5
• A
• B
• C
• D
• E

Q4:

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

 Ionization Reaction 𝐾 a at 2 5 ∘ C 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 + – 6 . 8 × 1 0 − 4 1 . 8 × 1 0 − 4 1 . 8 × 1 0 − 5 2 . 9 × 1 0 − 8 2 . 8 × 1 0 − 9
• A
• B
• C
• D
• E