CH-1879

Titration calculations

Chemistry · Secondary 4 · Hard · Titration calculations

A 2.50 g sample of an iron(II) salt is dissolved and made up to 250 cm³. 25.0 cm³ of this solution requires 22.0 cm³ of 0.0200 mol/dm³ acidified

MnO_4^-

for complete reaction.

5Fe^{2+} + MnO_4^- + 8H^+ \rightarrow 5Fe^{3+} + Mn^{2+} + 4H_2O

.

How many moles of

Fe^{2+}

are present in the original 250 cm³ solution?

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