Aqueous solution of HNO3, KOH,CH3COOH and CH3COONa of identical cocenteration are provided. The pair (s) of solution which forms buffer upon mixing is (are)
A
HNO3 and CH3COOH
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B
KOHandCH3COONa
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C
HNO3 and CH3COONa
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D
CH3COOHandCH3COONa
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Solution
The correct option is DCH3COOHandCH3COONa A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid, of all options, only in option d there is a pair of a weak acid (CH3COOH) and salt of its conjugate base(CH3COONa) . Hence, CH3COOHandCH3COONa are buffer solution.