Question

A voltaic cell consists of a Zn/Zn2+ half-cell and a Ni/Ni2+ half-cell at 25 ∘C.

The initial concentrations of Ni2+ and Zn2+ are 1.50molL−1 and 0.100 molL−1, respectively.

Zn2+(aq)+2e−→Zn(s) E∘=−0.76V

Ni2+(aq)+2e−→Ni(s) E∘=−0.23V

What are the concentrations of Ni2+ and Zn2+ when the cell potential falls to 0.46 V?