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Which of the following solutions added t...

Which of the following solutions added to 1L of a 0.01 M `CH_(3)COOH` solution will cause no change in the degree of dissociation of `CH_(3)COOH` and pH of the solution ?
`(K_(a)=1.6xx10^(-5)` for `CH_(3)COOH)`

A

`0.6mM HCOOH (K_(a)=8xx10^(-4))`

B

`0.1 M CH_(3) COONa`

C

`0.4 mMHCl`

D

`0.01 M CH_(3)COOH`

Text Solution

Verified by Experts

In `0.6 m M HCOOH` solution.
`K_(a)=([H^(+)]^(2))/(C-[H^(+)])rArr 8xx10^(-4)=([H^(+)]^(2))/(6xx10^(-4)-[H^(+)])`
`:.[H^(+)]=4xx10^(-4)M`
so solution in A ,C and D are `ISOHYDRIC`.
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