Question

Calculate the equilibrium constant for the redox reaction at 25°C.

Sr_(s) + Mg²⁺ → Sr²⁺_(aq) + Mg_(s),

that occurs in a galvanic cell. Write the cell formula.

E⁰_Mg = – 2.37 V and E⁰_Sr = – 2.89 V.

Answer 1

Given : 

Cell reaction : 

Sr_(s) + Mg²⁺ → Sr²⁺_(aq) + Mg_(s)

\(E^0_{Mg^{2+}/Mg}\)= -2.37 V; 

\(E^0_{Sr^{2+}/Sr}\) = -2.89 V 

Equilibrium constant K = ?

The formation of the cell :

∴ Equilibrium constant = K = 3.698 × 10¹⁷