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1 M benzoic acid (pK(a)=4.2) and 1 M C(6...

`1 M `benzoic acid `(pK_(a)=4.2)` and `1 M C_(6)H_(5)COONa` solutions are given separately. What is the volume of benzoic acid required to prepare a `93mL` buffer solution of `pH=4.5`?

Text Solution

Verified by Experts

`pH = pK_(a) + (log)([HCO_(3)^(-)])/([C_(6)H_(5)CO_(3)]) rArr 4.5 = 4.2 + log ((V_(2))/(V_(1))) rArr (V_(2))/(V_(1)) = 2`
`:.` volume of `C_(6)H_(5)COONa` required `= V_(@) = 62 mL`
volume of `C_(6)H_(5)COOH` required `= V_(1) = 31 mL`.
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Knowledge Check

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