What is the potential of a cell containing hydrogen electrodes, the negative one in contact with `10^(-10) M H^(+)` and positive one in contract with `0.025MH^(+)`?

Options

A. 0.18 V
B. 0.28 V
C. 0.38 V
D. 0.48 V

Answer

C

Explanation

At anode: `1/2 H_(2) to H^(+)(10^(-8) M) + e^(-)` (oxidation)
At cathode: `H^(+) (0.025 M) + e^(-) to 1/2 H_(2) ("reduction")`
Cell raction is:
`H^(+) (0.025 M) to H^(+) (10^(-8) M), E_("cell") = 0.38 V`