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Calculate the pH of 0.1 (N) acetic acid ...

Calculate the pH of 0.1 (N) acetic acid solution. Given: `K_(a)` (acetic acid)`=1.8xx10^(-5)`

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`0.1(N)" "CH_(3)COOH` solution `-=0.1(M)CH_(3)COOH`
solution `[because CH_(3)COOH" is a monobasic acid"]`
As, `K_(a)(CH_(3)COOH)=1.8xx10^(-5)`
`therefore pK_(a)=-log_(10)K_(a)=-log_(10)(1.8xx10^(-5))=4.74`
`CH_(3)COOH` is a weak monobasic acid. for such an acid solution, `pH=(1)/(2)pK_(a)-(1)/(2)logc`
`therefore`For 0.1(N) `CH_(3)COOH` solution,
`pH=(1)/(2)xx4.74-(1)/(2)log0.1=2.87`
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