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  • Calculate the e.m.f. (in V) of the given cell at 25oC.             <img alt="\mathrm{P t\left(H_{2}\right)|H C l|\left(H_{2}\right) P

Calculate the e.m.f. (in V) of the given cell at 25oC.
            \mathrm{P t\left(H_{2}\right)|H C l|\left(H_{2}\right) P t}
                2 atm                 10 atm

Option: 1

-0.0206


Option: 2

0.0206


Option: 3

0.059


Option: 4

0.698


Answers (1)

best_answer

The reaction in the given concetration cell is

\begin{matrix} H_2&+ & 2H^+\rightarrow 2H^+&+ &H_2 \\ (LHS) & &&& (RHS) \end{matrix}

\begin{array}{l}{\therefore \text { From the Nernst equation,}} \\\\ {\qquad \begin{aligned} E_{\text {cell }} &=\frac{0.059}{2} \log \frac{P_{\mathrm{H}_{2}(\mathrm{L} . \mathrm{H} . \mathrm{S} .)}}{P_{\mathrm{H}_{2}(\mathrm{RH} . \mathrm{S} .)}} \\ &=\frac{0.059}{2} \log \frac{2}{10}=-0.0206 \mathrm{\: V} \end{aligned}}\end{array}


 

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jitender.kumar

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