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The concentration of hydrogen ions in a ...

The concentration of hydrogen ions in a `0.2M` solution of formic acid is `6.4 xx 10^(-3) mol L^(-1)`. To this solution, sodium formate is added so as to adjust the concentration of sodium formate to `1 mol L^(-1)`. What will be the `pH` of this solution? The dissociation constant of formic acid is `2.4 xx 10^(-4)` and the degree of dissociation fo sodium formate is `0.75`.

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