Question

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?
A. `3.84`
B. `4.76`
C. `4.34`
D. `5.21`

Answer 1

Correct Answer - B
`p^(H) = p^(ka) + "log" (["salt"])/(["acid"])`
`= 4.75 + "log" (20 xx 0.5)/(10 xx 1)`