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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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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