Two electrolysis cells are set up in series so that the same current flows through each. In one compartment 5.40 g of Ag (molar mass = 108 g/mol) is deposited from a Ag+ solution. What mass of Cu (molar mass = 64 g/mol) is deposited simultaneously if the other cell contains Cu2+?

I don't know how to do this. I am confused that both are positive? and it doesn't have a redox reaction? Help on how to do?

1 answer

How many coulombs were needed to deposit the 5.4 g Ag. That's 96,485 coulombs x (5.4/108) = approx 4824. How many grams Cu will be deposited with 96,485? That is 64/2 = 32 g. You didn't have 96,485; you had 4824. So
32 x (4,824/96,495) = ?

Redox reactions are
Ag^+ + e ==> Ag(s)
Cu^2+ + 2e ==> Cu(s)
The oxidation reaction(s) depend(s) upon the anions in the water solutions.