A galvanic cell is composed of these two half cells, with the standard reduction potentials shown CO2+(aq) + 2 e‑ º Co(s) ‑0.28 volt
Cr3+(aq) + 3 e‑ º Cr(s) ‑0.74 volt
The actual Co2+(aq) concentration is 0.00100 M, while the Cr3+(aq) concentration is unknown.
The actual cell potential Ecell measured 0.38 volts. What is the actual concentration of the Cr3+ ion
in the cell?
a. 0.00180 M
b. 0.00500 M
c. 0.0090 M
d. 0.0360 M
e. 0.360 M