InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
`100 mL` of `0.02M` benzoic acid `(pK_(a)=4.2)` is titrated using `0.02 M NaOH`. `pH` values after `50 mL` and `100 mL` of `NaOH` have been added areA. `3.50,7`B. `4.2,7`C. `4.2,8.1`D. `4.2,8.25` |
|
Answer» Correct Answer - C `underset(t_(eq))underset(t=0)(C_(6)H_(5)COOH)+underset(1)underset(2)(OH^(-)) rarr underset(-)underset(1)(C_(6)H_(5)COO^(-))+ underset(1)underset()(H_(2)O)` `pH=pK_(a)=4.2` `underset(t_(eq))underset(t=0)(C_(6)H_(5)COOH)+underset(-)underset(2)(OH^(-)) rarr underset(-)underset(2)(C_(6)H_(5)COO^(-))+ underset(2)underset()(H_(2)O)` `[C_(6)H_(5)COO^(-)]=(2)/(200)=0.01 M` `:. pH=7+pK_(a)+(1)/(2)logC` `=7+(4.2)/(2)+(1)/(2)log(0.01)=8.1` |
|