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A buffer solution is prepared by mixing ...

A buffer solution is prepared by mixing `10ml` of `1.0 M` acetic acid & `20 ml` of `0.5 M` sodium acetate and then diluted to `100ml` with distilled water. If the `pK_(a)` of `CH_(3)COOH` is `4.76`. What is the pH of the buffer solution prepared?

Text Solution

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The correct Answer is:
4.76
Total volume = 100 mL
[acid] `=10 mL xx 1.0/100 = 0.1`
[salt] = 20 mL `xx 0.5/100 = 0.1`
pH of acidic buffer `=pK_(a) + log (["salt"])/(["acid"])`
`=4.76 + log(0.1)/(0.1) = 4.76`
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