Mikaela B.

# Galvanic cell based on half-reactions

A galvanic cell is based on the following half- reactions:

Cu+2 (aq) + 2e- à Cu (s)            ɛ° = 0.34 V

V+2 (aq) + 2e- à V (s)                   ɛ° = -1.20 V

In this cell, the copper compartment contains a copper electrode and [Cu+2] = 1.00 M, and the vanadium compartment contains a vanadium electrode and V2+ at an unknown concentration. The compartment containing the vanadium (1.00 L of solution) was titrated with 0.0800 M H2EDTA2-, resulting in the reaction:

H2EDTA2- (aq) + V2+ (aq) ßà VEDTA2- (aq) + 2H+ (aq)     K=?

The potential of the cell was monitored to determine the stoichiometric point for the process, which occurred at a volume of 500.0 mL H2EDTA2- solution added. At the stoichiometric point, the cell potential was observed to be 1.98 V. The solution was buffered at a pH of 10.00.

a.) Calculate the cell potential of the cell before the titration was carried out.

b.) Calculate the value of the equilibrium constant, K, for the titration reaction.

Ellen E.

Did they specify a temperature?
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05/26/19

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Mikaela B.

Thank you! Though, I am not sure if you explained the answer for b?
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05/27/19

Ellen E.

HI Mikaela! I posted b just a little bit later. Do you see it now? Let me know if you have any questions!
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05/27/19

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