Which of the following type of salt can act as a buffer?
Correct answer: B. Salt of strong acid & weak base
- A. Salt of strong acid & strong base
- B. Salt of strong acid & weak base
- C. Salt of weak acid & weak base
- D. All of the above
Explanation
A buffer solution is typically composed of a weak acid and its conjugate base or a weak base and its conjugate acid. Therefore, a salt formed from a strong acid and a weak base can act as a buffer because it can supply the conjugate acid needed to maintain pH stability. In contrast, salts of strong acids and strong bases do not resist changes in pH, and salts of weak acids and weak bases do not effectively maintain a stable pH.
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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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