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What is the pH of HCl solution when the hydrogen gas electrode shows a potential of -0.22 V at standard temperature and pressure?(a) 2.17(b) 2.98(c) 3.73(d) 3.14This question was posed to me in a national level competition.Asked question is from Electrochemistry in division Electrochemistry of Chemistry – Class 12

Answer»

The correct OPTION is (c) 3.73

For explanation I would say: GIVEN, potential of hydrogen gas ELECTRODE = -0.22 V

Electrode REACTION: H^+ + e^– → 0.5 H2

Applying Nernst equation,

E(H+/H₂) = E°(H+/H2) – 0.059 LOG (1/ [H^+])

E°(H+/H₂) = 0 for hydrogen gas electrode

-0.22 = 0.059 log H^+

-0.22 = -0.059pH

pH= 3.73.


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