Question

Reduction potential of a hydrogen electrode at $pH=0$ is near about?

• A. $0V$
• B. $-0.592V$
• C. $0.592V$
• D. Data insufficient

Answer 1

The correct option is A $0V$

Reaction of hydrogen electrode :

$2H^{+}+2e^{-}\rightleftharpoons H_2$

Nearest equation,

$E_{cell}=E^0-\frac{0.059}{n}log\left[\frac{P_{H_2}}{{\left(H^{+}\right)}^2}\right]$

$E_{cell}=0-\frac{0.059}{2}log\left(\frac{1}{{\left(H^{+}\right)}^2}\right)$

$E_{cell}=0-0.059pH$

$E_{cell}=0$

$\because pH=-log\left[H^{+}\right]$