62. Solving a chemistry problem

4) Calculate the redox potential of the redox pair Cr2O72-, H | Cr3 in a solution obtained by mixing 100 ml of a solution of potassium dichromate with a concentration of C (K2Cr2O7) \u003d 0.1 mol / l, 50 ml of a solution of Cr (III) chloride with a concentration of C (CrCl3) \u003d 0.1 mol / l and 100 ml of a solution sulfuric acid with concentration С (H2SO4)=0.125 mol/l