मराठी

Chemistry Involved in Preparation of Inorganic Compounds

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Estimated time: 6 minutes
CBSE: Class 12

Key Points: Chemistry Involved in Preparation of Inorganic Compounds

Mohr's Salt:

  • Formula: FeSO₄(NH₄)₂SO₄·6H₂O (ferrous ammonium sulphate)
  • Preparation: Dissolve equimolar quantities of hydrated ferrous sulphate and ammonium sulphate in water containing a small amount of dil. H₂SO₄ (to prevent hydrolysis of Fe²⁺ ions) → concentrate → cool → light blue or green crystals
  • FeSO₄·7H₂O + (NH₄)₂SO₄ → FeSO₄(NH₄)₂SO₄·6H₂O + H₂O
  • It is a double salt and a primary standard in volumetric analysis
  • Does NOT lose water of crystallisation on exposure to air; not oxidised in the solid state

Potash Alum:

  • Formula: K₂SO₄·Al₂(SO₄)₃·24H₂O → also written as KAl(SO₄)₂·12H₂O
  • Preparation: Dissolve equimolar quantities of hydrated aluminium sulphate and potassium sulphate in a minimum amount of water + dil. H₂SO₄ → concentrate → cool → colourless octahedral crystals
  • K₂SO₄ + Al₂(SO₄)₃·18H₂O + 6H₂O → K₂SO₄·Al₂(SO₄)₃·24H₂O (Potash Alum)
  • Alums = double sulphates (general formula X₂SO₄·M₂(SO₄)₃·24H₂O, where X = monovalent cation, M = trivalent cation)
  • Alums are isomorphous, crystalline, soluble in water; they undergo hydrolysis (aqueous solution is acidic)
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