Standard Potential calculation question?

Question

From the standard potential Tl^+ + e^- -----> Tl (solid) E=-0.336 V

Determine the standard potential of

Tl_2S (solid) + 2e^- -----> 2Tl (solid) + S^2-

Given that the K_sp for Tl_2S is 1.2x10^-22

Answer 1

Actually

on wikipedia