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  • If hydrogen electrodes dipped in two solutions of pH = 3 and pH = 6 are connected by a salt bridge, the EMFcell (in V) is:Option: 1 0

If hydrogen electrodes dipped in two solutions of pH = 3 and pH = 6 are connected by a salt bridge, the EMFcell (in V) is:

Option: 1

0.052


Option: 2

0.067


Option: 3

0.277


Option: 4

0.177


Answers (1)

best_answer

For the given concentration cell:
\begin{array}{l}{\mathrm{H}_{2}\left|\mathrm{H}^{-}\left(c_{1}\right) \| \mathrm{H}^{+}\left(c_{2}\right)\right| \mathrm{H}_{2}} \\ {\mathrm E_{\text {cell }}=-0.059\left(\mathrm{pH}_{\mathrm{c}}-\mathrm{pH}_{\mathrm{a}}\right)} \\ {\quad=-0.059(3-6)=0.1773 \mathrm{V}} \\ {\text { Cell will be feasible only when }} \\ {\left[c_{2}\right]_{\mathrm{c}}>\left[c_{1}\right]_{\mathrm{a}} \text { or } \mathrm{pH}_{\mathrm{c}}<\mathrm{pH}_{\mathrm{a}}}\end{array}

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avinash.dongre

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