The aqueous solution of which of the following can form buffer solution?
Correct answer: D. All of these
- A. HF & NaF
- B. NH₃ & NH₄Cl
- C. CO₃²⁻ & Na₂CO₃
- D. All of these
Explanation
A buffer solution is formed by a mixture of a weak acid and its conjugate base, or a weak base and its conjugate acid. In option A, HF (weak acid) and NaF (conjugate base) can form a buffer. Option B, NH₃ (weak base) and NH₄Cl (conjugate acid) also form a buffer. Similarly, in option C, CO₃²⁻ and Na₂CO₃ form a buffer system with CO₃²⁻ acting as the base and HCO₃⁻ (from Na₂CO₃) as the acid. Therefore, option D, 'All of these,' correctly indicates that all pairs can form buffer solutions.
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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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