A 25.0 cm³ aliquot of a solution containing Fe²⁺ and Fe³⁺ ions was acidified and…
CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A 25.0 cm³ aliquot of a solution containing Fe²⁺ and Fe³⁺ ions was acidified and titrated against 0.0200 M potassium manganate (VII) solution, requiring 15.0 cm³. Zn reduces Fe³⁺ to Fe²⁺ and a second aliquot was reduced by zinc and after filtering off the excess zinc, was titrated with the same potassium manganate solution, requiring 19.0 cm³. Calculate the concentrations of the Fe²⁺ and Fe³⁺ in the solution.