ElectrochemistryHard
Question
A galvanic cell is composed of two hydrogen electrodes, one of which is a standard one. In which of the following solutions should the other electrode be immersed to get maximum emf ?
Ka (CH3COOH) = 2 × 10-5, Ka (H3PO4) = 10-3.
Ka (CH3COOH) = 2 × 10-5, Ka (H3PO4) = 10-3.
Options
A. 0.1 M HCl
B.0.1 M CH3COOH
C.0.1 M H3PO4
D.0.1 M H2SO4
Solution
Ecell = 0.059 log 
For Ecell to be +ve and maximum
< 1 or C1 < C2 Give C2 = 1M.
∴ C1 should be the minimum conc. of H+. ∴(B) is the right answer.
For Ecell to be +ve and maximum
< 1 or C1 < C2 Give C2 = 1M.∴ C1 should be the minimum conc. of H+. ∴(B) is the right answer.
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