Question

3. For the electrochemical cell: Pt(s) | H2(1 atm) | H(I M)I| C u2(1 M) Cu(s), which one of the following changes will cause an increase in the cell voltage? A) Lower the H2(g) pressure. B) Increase the size/mass of the copper electrode. C) Lower the H (aq) concentration. D) Decrease the concentration of Cu* ion. E) None of the above. 2+
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Answer #1

cell reaction is

H2 (g) + Cu^2+ (aq) .................> Cu (s) + 2 H+ (aq)

Q = [H+]^2 / ([Cu^2+] * P(H2))

Nernst equation is

Ecell = E0cell - 0.059 / n * log Q

Lower the H+ ion concentration leads to decrease in Q value.

As a result, Ecell increases.

option C) lower the H+ (aq) concentration is the answer.

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