Which is not true about buffer solution?
Correct answer: C. The solution's pH may or may not change significantly during chemical reactions.
- A. The solution resists changes in its pH when small amounts of acid or base are added.
- B. The solution maintains a constant pH under typical conditions.
- C. The solution's pH may or may not change significantly during chemical reactions.
- D. The solution resists changes enough to maintain its pH within a narrow range.
Explanation
Buffer solutions are specially designed to resist changes in their pH levels when small amounts of acids or bases are added. They work by using a weak acid and its conjugate base (or a weak base and its conjugate acid) to neutralize added acids or bases. Therefore, statements that describe the buffer's ability to maintain or resist pH changes are true.Option C is the correct answer because a properly functioning buffer solution should not 'may or may not' change its pH significantly during chemical reactions; instead, it should consistently resist such changes within its capacity.
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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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