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Highly selective Backlog Qs for JEE MainChemistryIonic Equilibrium

The pH of an aqueous solution containing 1 M benzoic acid pK a = 4 . 20 and 1 M sodium benzoate is 4 . 5 . The volume of benzoic acid solution in 300 mL of this buffer solution is __________ mL .

Correct answer

100

Step-by-step solution

Benzoic acid + Sodium benzoate Molarity 1 M 1 M Volume V a ml V s ml milli moles V a × 1 V s × 1 pH = 4 . 5 pK a = 4 . 20 pH = pK a + log [ salt ] [ acid ] 4 . 5 = 4 . 2 + log V s V a Where , V s - Volume of salt V a - Volume of acid V s V a = 2 ..........(i) V s + V a = 300 ........(ii) V a = 100 ml

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