The potential generated by the cell when the concentration of Ni2+ is 0.126 M and the concentration of Zn2+is 0.0169 M is

Question

The standard potential for the cell using the overall cell reaction below is +0.48 V:

 Zn (s) + Ni²⁺ (aq) → Zn²⁺ (aq) + Ni (s)

Enter answer as decimal format with 3 decimals.

Answer 1

Nernst equation:

Ecell = Eºcell - RT/nF lnQ

Since no temperature is given, we'll assume standard temperature of 298K. In this case, the Nernst equation can be simplified to

Ecell = Eºcell - 0.0592/n log Q

Ecell = 0.48V - 0.0592/2 x log (0.0169/0.126)

Ecell = 0.48 - 0.0296 x -0.872 = 0.48 + 0.0258

Ecell = 0.51 V