Fixed volume of 0.1M benzoic acid (pKa=4.2) solution is added into 0.2M sodium benzoate solution and formed a 300ml resultant acidic buffer solution. If pH of this buffer solution is 4.5 then find the added volume of benzoic acid.
A
100ml
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B
150ml
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C
200ml
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D
Noneofthese
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Solution
The correct option is B150ml As we know, pH=pKa+log(saltacid)