Answer to Question #113144 in General Chemistry for Beverlie

Question

A voltaic cell is constructed based on the following pair of half-reactions. Identify the components in the cell below.
Ag+(aq)+1e− ---> Ag(s) +0.7996 V
Cd2+(aq)+2e− ---> Cd(s) -0.403 V
Write the the overall balanced equation, inluding states of matter.

Answer 1

Since the emf of the first reaction is higher than the 2nd reaction the 2nd reaction will be reversed. And to balance the no of electron transfer the first reaction is multiplied with 2.The final reaction will be

2Ag+(aq) + Cd(s) = 2Ag(s) + Cd2+(aq)