Q 2603212148.     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? `K_a` for acetic acid `= 1.8 xx 10^- 5`

A

2.03

B

0.775

C

2.325

D

3.172

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