NEET 2012 Chemistry question

Buffer solutions have constant acidity and alkalinity because:

(1)they have fixed value of pH
(2)these give unionised acid or base on reaction with added acid or alkaliCorrect
(3)acids and alkalies in these solutions are shielded from attack by other ions
(4)they have large excess of or ions

Answer: (2)

Solution

A buffer contains a weak acid and its conjugate base (or a weak base and its conjugate acid). On adding , it is consumed by the conjugate base to form the unionised weak acid, and on adding it is neutralised by the weak acid to form water and the conjugate base. Thus the added

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Question ID VK-091106