1.

`100 mL` of `0.3 N`-Acetic acid solution is mixed with same volume of `0.2 N` sodium hydroxide solution. Ionisation constant of acetic acid is `2 xx 10^(-5)` the pH of the mixture isA. `10`B. `7`C. `5`D. `9`

Answer» Correct Answer - C
`CH_(3)COOH + NaOH rarr CH_(3)COONa + H_(2)O`
`100 xx 0.3 , 100 xx 0.2`
`(CH_(3)COOH) = (100 xx 0.3) - (100 xx 0.2)`
`[CH_(3)COONa] = 100 xx 0.2`
`pKa = - log k_(a)`


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