First slide

Nernst Equation

Question

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be?

Moderate

Solution

$\underset{1 a t m}{H_{2}} \to \underset{10^{- 10}}{2 H^{+}} + 2 e^{-} E_{H_{2} / H^{+}} = 0 - \frac{0.059}{2} \log \frac{{(10^{- 10})}^{2}}{1} E_{H_{2} / H^{+}} = + 0.59 V$

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