First slide

Electrochemical cells

Question

The reduction potential of hydrogen half-cell will be negative if:

Moderate

A

$P (H_{2}) = 1 atm and [H^{+}] = 2 .0 M$
B

$P (H_{2}) = 1 atm and [H^{+}] = 1 .0 M$
C

$P (H_{2}) = 2 atm and [H^{+}] = 1 .0 M$
D

$P (H_{2}) = 2 atm and [H^{+}] = 2 .0 M$

Solution

$\begin{array}{l} 2 H_{(4))}^{+} + 2 e^{-} ⟶ H_{2 (3)} \\ E_{RP} = E_{RP}^{+} - \frac{0 .0591}{n} \log \frac{P_{H_{2}}}{{[H^{+}]}^{2}} \\ = 0 - \frac{0 .0591}{2} \log \frac{2}{(1)^{2}} \end{array}$

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