मराठी

Analysis of Cations - Analysis of Group-V Cations

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Analysis of Group V Cations

Analysis of Group V Cations (Ba²⁺, Ca²⁺, Sr²⁺):

  • Group reagent: (NH₄)₂CO₃ in presence of NH₄OH
  • All precipitate as white carbonates (BaCO₃, CaCO₃, SrCO₃)
  • Dissolve in CH₃COOH + add K₂CrO₄ → yellow ppt. of BaCrO₄ (Ba²⁺ confirmed); SrCO₃ and CaCO₃ remain
  • Test for Ba²⁺: K₂CrO₄ → yellow BaCrO₄↓; also (NH₄)₂SO₄ → white BaSO₄ (insoluble even in conc. HNO₃)
  • Test for Sr²⁺: dissolve ppt. in CH₃COOH + NH₄OH + (NH₄)₂SO₄ → white SrSO₄ precipitate
  • Test for Ca²⁺: (NH₄)₂C₂O₄ (ammonium oxalate) → white CaC₂O₄ precipitate; CaC₂O₄ soluble in dil. HCl → solution + K₄[Fe(CN)₆] → white ppt. of calcium potassium ferrocyanide

Flame Test:

  • Ba²⁺ → Green flame
  • Sr²⁺ → Crimson red flame
  • Ca²⁺ → Brick red flame
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