CHEM Problem - Cell potential

A 20.00 mL aliquot of 0.120 M Cu+ solution is titrated with a 0.100 M solution of Ce4+ according to the following reaction:

Cu+ + Ce4+ ---> Cu2+ + Ce3+

a. what is the equivalence point volume?

What is the cell potential at each of the following volumes of added Ce4+?

b. 5.00 mL
c. 12.00 mL
d. V equilvalence point
e. 48.00 mL