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Calculate the H^(+) ion concentration in...

Calculate the `H^(+)` ion concentration in 0.05M formic acid at 298K. `(K_(a)=1.8xx10^(-4)` for HCOOH).

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Verified by Experts

For a weak monobasic acid, `[H_(3)O^(+)]=sqrt(Calpha)`
`[H_(3)O^(+)]=sqrt(0.04xx1.8xx10^(-4))=2.683xx10^(-3)"mol "dm^(-3)`
`[H_(3)O^(+)][OH^(-)]=10^(-14)`
`therefore[OH^(-)]=(10^(-14))/(2.683xx10^(-3))=3.727xx10^(-12)"mol "dm^(-3)`
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