Observations to prepare a pure sample of ferrous ammonium sulphate
Answers
Explanation:
Aim
To prepare Mohr’s salt: ferrous ammonium sulphate from ferrous sulfate and ammonium sulfate in the presence of acid.
Theory
The formula for ferrous ammonium sulfate is FeSO4.(NH4)2SO4.6H2O. It is prepared by dissolving equimolar mixture of hydrated ferrous sulfate and ammonium sulfate in water containing a little sulfuric acid. The solution is subjected to crystallization, ferrous ammonium sulfate separates out from the solution.
The chemical reaction is given below.
FeSO4 + (NH4)2SO4 + 6H2O → FeSO4.(NH4)2SO4.6H2O (Mohr’s salt)
The addition of sulfuric acid in this experiment prevents the hydrolysis of this salt. Ferrous ammonium sulfate is a pale green crystalline compound which does not effloresce like ferrous sulfate. It is less readily oxidised than FeSO4 and therefore, a better volumetric reagent in preference to ferrous sulfate.
Mohr’s salt is also called as double salt which contain more than one simple salt. It undergoes complete dissociation in aqueous solutions. Mohr’s salt dissociates into Fe2+, NH4+, SO42- ions and give their individual chemical test.
Answer:
Observations:
Colour of the crystals: Light Green
Shape of the crystals: Monoclinic
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