3.00 g of a lawn sand containing an iron (II) salt was shaken with dilute H₂SO₄

CHEMISTRY · Subjective · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

3.00 g of a lawn sand containing an iron (II) salt was shaken with dilute H₂SO₄. The resulting solution required 25.00 cm³ of 0.0200 mol dm⁻³ potassium manganate (VII) to oxidise the Fe²⁺ ions in the solution to Fe³⁺ ions. Use this to calculate the percentage by mass of Fe²⁺ ions in this sample of lawn sand.

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