A certain mixture of `HCl` and `CH_(3)-COOH` is `0.1 M` in each of the acids. `20 ml` of this solution is titrated against `0.1 M NaOH`. By how many units does the `pH` change from the start to the stage when the `HCl` is almost completely neutralised and acidic acid remains unreacted? `K_(a)` for acetic acid `=2xx10^(-5)`.A. `1.5`B. `3`C. `2`D. `3.25`

A certain mixture of `HCl` and `CH_(3)-COOH` is `0.1 M` in each of the

1.	A certain mixture of `HCl` and `CH_(3)-COOH` is `0.1 M` in each of the acids. `20 ml` of this solution is titrated against `0.1 M NaOH`. By how many units does the `pH` change from the start to the stage when the `HCl` is almost completely neutralised and acidic acid remains unreacted? `K_(a)` for acetic acid `=2xx10^(-5)`.A. `1.5`B. `3`C. `2`D. `3.25`
Answer» Correct Answer - B mmoles of `HCl=0.1xx20=2` mmoles of `CH_(3)COOH=0.1xx20=2` After titration of `HCl` by `NaOH` `[CH_(3)COOH]=(2)/(40)=(1)/(20)M` `pH=(1)/(2)(pK_(a)-log C)` `=(1)/(2)[5-log2-log``((1)/(20))]=3`

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