Question

.2 faraday charge is passed in 1 litre solution containing 0.1 molar Fe+3 ions. How many moles of iron get deposited at cathode assuming only iron is reduced in electrolytic process.
(E0Fe+3/Fe+2=0.77

Answer 1

0.05 moles.

Explanation:

Given: .2 faraday charge is passed in 1 litre solution containing 0.1 molar Fe+3 ions.

E0Fe+3/Fe+2 = 0.77 V

E0Fe+2/Fe = -0.44V

Find: How many moles of iron get deposited at cathode assuming only iron is reduced in electrolytic process.

Solution:

E0Fe+3/Fe = -0.037V as the reduction potential of Fe3+/Fe+2 is higher initially. All FE+3 converts into Fe+2, which further gets reduced to metallic iron.

Answer is 0.05 moles.