At certain temperature, dissociation constant of formic acid and acetic acid are `1.8xx10^(-4)` and `1.8xx10^(-5)` respectively. At what concentration
At certain temperature, dissociation constant of formic acid and acetic acid are `1.8xx10^(-4)` and `1.8xx10^(-5)` respectively. At what concentration of acetic solution, the `H_93)O^(+)` ion concentration is same as that in 0.001 M formic acid solution
A. `0.01 M`
B. `1xx10^(-3)M`
C. `1xx10^(-1)M`
D. `1xx10^(-4)M`.
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Correct Answer - A
`[H_(3)O^(+)]=sqrt(K_(a)xxC)`
Let conc. Of acetic acid is `C_(1)` and that of formic acid is `C_(2)`
`sqrt(1.8 xx 10^(-5)xxC_(1))=sqrt(1.8 xx 10^(-4)xx.001)`
or `C_(1)=(1.8 xx 10^(-4)xx0.001)/(1.8 xx 10^(-5))=0.01`
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