What is the cathode pH in Co/Co2+(1.00 M)//H1+(x M), H2(1.0 atm)/Pt if E = 0.06 V? Give the pH to 0.01.?

Question

I have another question:
What is the cell potential of the following cell at 25 oC? Note Au is a passive electrode
Cu / Cu2+ (0.00410 M) // Cr3+ (0.440 M), Cr2O72- (0.0460), H1+ (1.00 M) / Au

for the first question I've already tried: 4.83 and 5.74
for the second question I've already tried: .94278 V and .91318 V

Answer 1

Use the Nernst eqn and then the Henderson eqn.