Consider the following electrochemical cell : Pt | O2(g) (1bar) | HCl (aq) || M 2+(aq, 1.0 M) | M(s) The pH above which, oxygen gas would start to evolve at anode is _______ (nearest integer). 2 0 M /

Question

Consider the following electrochemical cell : Pt | O2(g) (1bar) | HCl (aq) || M 2+(aq, 1.0 M) | M(s) The pH above which, oxygen gas would start to evolve at anode is _______ (nearest integer). 2 0 M /M O /H O E 0.994V Given : standard reduction potential E 1.23V RT and (2.303) 0.059 V at the given condition F

Prashant Kotian · Accepted Answer

Correct answer: .. For spontaneity Ecell > 0 At limiting condition : EOxi (anode) = –ERed (cathode) H2O  2H + + 1 2 O2 + 2e – E = E° – 2 1/2 O [H ] P 0.059 log 1           –0.997 = –1.23 + 0.059 × pH pH = 3.94 pH 4

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