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Question

Fixed volume of 0.1 M benzoic acid (pKa=4.2) solution is added into 0.2 M sodium benzoate solution and formed a 300 ml resultant acidic buffer solution. If pH of this buffer solution is 4.5 then find the added volume of benzoic acid.

A
100 ml
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B
150 ml
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C
200 ml
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D
None of these
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