onsider the following electrochemical cell : The pH above which, oxygen gas would start to evolve at anode is ________ (nearest integer) [2026]

Question

Consider the following electrochemical cell :

$P t | O_{2} (g) (1 b a r) | H C l (a q) ‖ M^{2 +} (a q, 1.0 M) | M (s)$

The pH above which, oxygen gas would start to evolve at anode is ________ (nearest integer).

[2026]

Smart Achievers · Accepted Answer

(4)

$For spontaneity E_{cell} > 0$

$At limiting condition :$

$E_{oxi} (anode) = - E_{red} (cathode)$

$H_{2} O \to 2 H^{+} + \frac{1}{2} O_{2} + 2 e^{-}$

$E = E ° - \frac{0.059}{2} \log [\frac{{[H^{+}]}^{2} \times P_{O_{2}}^{1 / 2}}{1}]$

$- 0.997 = - 1.23 + 0.059 \times pH$

$pH = 3.94$

$pH \approx 4$

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