The standard oxidation potential of Ni/Ni^2+ electrode is 0.3 V. If this is combined with a hydrogen electrode in acid solution, at what pH of the solution with the measured e.m.f. be zero at 25°C? (Assume [Ni^2+] = 1M)(a) 5.08(b) 4(c) 4.5(d) 5.25I got this question by my college director while I was bunking the class.I would like to ask this question from Electrochemistry in division Electrochemistry of Chemistry – Class 12

The standard oxidation potential of Ni/Ni^2+ electrode is 0.3 V. If th

1.	The standard oxidation potential of Ni/Ni^2+ electrode is 0.3 V. If this is combined with a hydrogen electrode in acid solution, at what pH of the solution with the measured e.m.f. be zero at 25°C? (Assume [Ni^2+] = 1M)(a) 5.08(b) 4(c) 4.5(d) 5.25I got this question by my college director while I was bunking the class.I would like to ask this question from Electrochemistry in division Electrochemistry of Chemistry – Class 12
Answer» The CORRECT choice is (a) 5.08 Best explanation: Given, Standard oxidation potential of Ni/Ni^2+ electrode, E°OP = 0.3 V, Ni → Ni^2+ + 2E 2H^+ + 2e → H2 E°cell = E° (OP) + E° (RP) E° (cell) = 0.3 + 0.0 = 0.3 V According to NERNST equation, E (cell) = E°(cell) + \(\frac{0.059}{2}\) log10([H^+]^2 / [Ni]^+2) 0 = 0.3 + \(\frac{0.059}{2}\)log10([H^+]^2) -log ([H^+]) = 5.08 pH = 5.08.

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