Which of the following can form a buffer solution?
Correct answer: D. All of these
- A. HNO₂ and NaNO₂
- B. HCN and NaCN
- C. NH₃ and (NH₄)₂SO₄
- D. All of these
Explanation
All of the options represent a mixture of a weak acid with its conjugate base (A and B) or a weak base with its conjugate acid (C). Therefore, all three combinations can be used to prepare 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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