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What is [H^(+)] in mol/L of a solution t...

What is `[H^(+)]` in mol/L of a solution that is 0.20 M in `CH_(3)COONa` and 0.10 M in `CH_(3)COOH` ? `(K_(a)` for `CH_(3)COOH=1.8xx10^(-5))`

A

`3.5xx10^(-4)`

B

`1.1xx10^(-5)`

C

`1.8xx10^(-5)`

D

`9.0xx10^(-6)`

Text Solution

Verified by Experts

The correct Answer is:
D
For acidic buffer solution
`[H^(+)]=(ka[CH_(3)COOH])/([CH_(3)COO^(-)])`
`=(1.8xx10^(-5)xx0.10)/(0.20)=9xx10^(-6)M`
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