A piece of iron wire weighs 2.225 g

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

Problem

A piece of iron wire weighs 2.225 g. It is dissolved in acid, which oxidises it to Fe²⁺, and made up to 250 cm³. A 25 cm³ sample required 31.0 cm³ of a 0.0185 mol dm⁻³ solution of potassium dichromate. Calculate the percentage of iron in the wire.

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