In two vessels each containing 500 ml water, 0.5m mol of aniline (`K_(b)=10^(-9))` and 25 m mol of HCl are added separately. Two hydrogen electrodes are constructed using these solutions. Calculate the emf of cell made by connecting them appropriately.

In two vessels each containing 500 ml water, 0.5m mol of aniline (`K_(

1.	In two vessels each containing 500 ml water, 0.5m mol of aniline (`K_(b)=10^(-9))` and 25 m mol of HCl are added separately. Two hydrogen electrodes are constructed using these solutions. Calculate the emf of cell made by connecting them appropriately.
Answer» Correct Answer - `E = 0.395V` For aniline `K_(b) = calpha^(2)` `10^(-9) = 10^(-3) alpha^(2)` `alpha^(2) = 10^(-6)` `alpha = 10^(-3)` `[OH]^(-) = 10^(-3) xx 10^(-3) = 10^(-6)` `[H^(+)] = 10^(-8)` `[H^(+)] = (25)/(500)` `[H^(+)] rArr 5 xx 10^(-2)`

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In two vessels each containing 500 ml water, 0.5m mol of aniline (`K_(b)=10^(-9))` and 25 m mol of HCl are added separately. Two hydrogen electrodes are constructed using these solutions. Calculate the emf of cell made by connecting them appropriately.

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