Chemistry

Problem

25 mL of a solution containing

\text{Fe}^{2+}

and

\text{Fe}^{3+}

sulphate acidified with

\text{H}_2\text{SO}_4

is reduced by 3 g of metallic zinc. The solution required 34.25 mL of

N/10

solution of

\text{K}_2\text{Cr}_2\text{O}_7

for oxidation. Before reduction with zinc, 25 mL of the same solution required 22.45 mL of same

\text{K}_2\text{Cr}_2\text{O}_7

solution. Calculate the strength of

\text{FeSO}_4

and

\text{Fe}_2(\text{SO}_4)_3

in solution.