Of iron(III) alum were dissolved in water and reduced to an iron(II) ion solution…

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

13.2\text{ g}

of iron(III) alum were dissolved in water and reduced to an iron(II) ion solution using zinc and dilute sulfuric acid. The mixture was filtered, and the filtrate and washings were made up to

500\text{ cm}^3

in a standard volumetric flask.

20.0\text{ cm}^3

of this solution required

26.5\text{ cm}^3

0.0100\text{ mol dm}^{-3}

\mathrm{KMnO}_4

for oxidation. Calculate the percentage by mass of iron in iron(III) alum.

Related theory

Stoichiometric Calculations
Redox Reactions
Half-reaction method

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