When `10 ml` of `0.1 M` acitec acid `(pk_(a)=5.0)` is titrated against `10 ml` of `0.1M` ammonia solution `(pk_(b)=5.0)`,the equivalence point occurs at `pH`

Options

A. `5.0`
B. `6.0`
C. `7.0`
D. `9.0`

Answer

C

Explanation

10 Ml of 0.1 M `CH_(3)COOH` will completely react with 10 mL of 0.1 M ammonia solution to give `CH_(3)COOH` (a salt of a weak acid and a weak base ). The pH of the resulting solution can be calculated as follows `:`
Here `pK_(a)=5.0 ,pK_(b)=5.0 , pK_(w)=14`
`:. pH =(1)/(2) [pK_(a)+pK_(w)-pK_(b)]=7`