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Question

The potential of a hydrogen electrode at pH=10 is:

A
0.59 V
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B
0.00 V
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C
0.59 V
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D
0.059 V
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Solution

The correct option is D 0.59 V
pH=10

[H+]=10pH

[H+]=1010 M
2H++2eH2

Ecell=E0cell0.059nlogPH2[H+]2

Ecell=0.0V0.0592log1atm[1010]2

Ecell=0.0592log1020

Ecell=0.059×202

Ecell=0.59V

The potential of a hydrogen electrode at pH=10 is 0.59 V.

Hence, the correct option is C.

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