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The dissociation constants for acetic ac...

The dissociation constants for acetic acid and HCN at `25^@C` are `1.5xx10^(-5)` and `4.5xx10^(-10)`, respectively. The equilibrium constant for the equilibrium. `CN^(-)+CH_3COOHhArrHCN+CH_3COO^(-)` would be

A

`3.0 xx 10^(4)`

B

`3.0 xx 10^(5)`

C

`3.0 xx 10^(-5)`

D

`3.0 xx 10^(-4)`

Text Solution

Verified by Experts

The correct Answer is:
A
`K_(c)=K_(a(CH_(3)COOH)) xx (1)/(K_(a(HCN)))`
`=1.5 xx 10^(-5) xx (1)/(4.5 xx 10^(-10))`
`~= 3 xx 10^(4)`
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