The aqueous solution of which one of the following compounds can maintain its pH constant?
Correct answer: C. NH₄OH and NH₄Cl
- A. CH₃COOH and (NH₄)₂SO₄
- B. NH₄NO₃ and KNO₃
- C. NH₄OH and NH₄Cl
- D. NH₄OH and NaCl
Explanation
A solution that maintains a constant pH is a buffer solution. A basic buffer is formed by mixing a weak base with the salt of that weak base and a strong acid. NH₄OH (a weak base) and NH₄Cl (its salt) form a basic buffer.
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