What is `DeltapH` ( final `-` initial `)` for `1//3 & 2//3` stages of neutralization of `0.1 M CH_(3)COOH` with `0.1 M NaOH`

Options

A. `+2 log 2`
B. `-2 log 3`
C. `2 log 1//4`
D. `2 log 2//3`

Answer

A

Explanation

Upon titration of acetic acid solution with `NaOH`. The solution will act as buffer before completion of titration.
`CH_(3)COOH+NaOrarr CH_(3)COONa+H_(2)O`
upon `(1)/(3)` Neutratization `(2)/(3)" "(1)/(3)`
`(P^(H))_(1)=Pk_(a)+log.(1//3)/(2//3)=Pka-log2" ".....(1)`
`CH_(3)COOH+NaOrarr CH_(3)COONa+H_(2)O`
upon `(2)/(3)` Neutarlization `(1)/(3)" "(2)/(3)`
`(P^(H))_(2)+Pk_(a)+log.(2//3)/(1//3)=Pka+log2" "....(2)`
`(1) & (2)`
`(P^(H))_(2)-(P^(H))_(2)=DeltaP^(H)=2log2" "Ans.(1)`