Question

A student measures the potential of a cell made up with 1.0 M CuSO4 in one...

A student measures the potential of a cell made up with 1.0 M CuSO4 in one solution and 1.0 M AgNO3 in the
other. There is a Cu electrode in the CuSO4 and a Ag electrode in the AgNO3. A salt bridge connects the 2
half cells. The student finds that the potential, or voltage of the cell, E°cell is 0.45 V and that the Cu electrode is
negative.
a. At which electrode is the oxidation occurring? ___________
b. Write the equation for the oxidation reaction.
c. Write the equation for the reduction reaction.
d. Write the overall equation for the reaction.
e. The student adds 6.0 M NH3 to the CuSO4 solution until the Cu2+ ion is essentially all converted to
Cu(NH3)42+ ion. The voltage of the cell, Ecell, goes up to 0.92 V and the Cu electrode is still negative.
Find the residual concentration of Cu2+ ion in the cell. (Use the Nernst Equation)
__________

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