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The concentration of iron(II) ions in water can be determined by titration with potassium permanganate in...

The concentration of iron(II) ions in water can be determined by titration with potassium permanganate in acid solution as shown by the incomplete unbalanced reaction equation below. Identify the stoichiometric coefficient of the iron(II) ion in the balanced reaction equation. Fe 2+( aq) + MnO4 – > Fe 3+( aq) + Mn 2+( aq)

Please explain why.

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Homework Answers

Answer #1

it is very simple just observe the change in oxidation state of Mn from reactant to product side.

this change is +5 as in MnO4- has Mn in +7 oxidation state and it finally becomes Mn2+.

so we require 5 electrons to facilitate this change.

STEP b)

also change in oxidation state of Fe is -1.

so iron(II) ion looses one electron and becoming Fe3+.

so balanced reaction is as follow:

finally becomes overall reaction is

stoichiometric is 1:5 ( one mole of MnO4- requires 5 moles of Fe(II) ions)

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