Predict the standard potential for the galvanic cell consisting of a...

Question

Predict the standard potential for the galvanic cell consisting of a platinum anode in a chromium(II) and chromium (III) ion solution with a copper cathode in a copper(II) ion solution. Refer to the table of standard reduction potentials.

Answer 1

From the table:

Cu²⁺ + 2e- ==> Cu ... Eº = 0.34 V

Cr³⁺ + e- ==> Cr²⁺ ... Eº = -0.407 V

Reduction half reaction will be Cu²⁺ + 2e- ==> Cu @ the cathode

Oxidation half reaction will be Cr²⁺ ==> Cr³⁺ + e- @ the anode

Eº_cell = 0.34 V + 0.407 V

Eº_cell = 3.807 V