Answer to Question #284410 in Chemistry for Shaan

Question

A fertiliser contains ammonium iron (II) sulphate, FeSO4.(NH4)2SO4.6H2O as a source of

iron.

A 6.50 g sample of this fertiliser is made up to 250 mL with dilute sulphuric acid. 25 mL of

this solution is reacted with 23.5 mL of 0.01 mol L-1 potassium dichromate (K2Cr2O7)

solution as shown by the balanced equation below

(i) Calculate the moles of Cr2O72+ ions that has reacted.

(ii) Determine the moles of Fe2+ ions that has reacted.

(iii) Calculate the mass of Fe in the 25 mL aliquot (M(Fe) = 56 g mol-1))

(iv) Determine the total mass of Fe present in the 6.50 g sample of fertiliser

(v) Calculate the percentage of Fe in the fertiliser.

Answer 1

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