मराठी

Analysis of Cations - Analysis of Zero Group Cation

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Estimated time: 2 minutes
CBSE: Class 12

Key Points: Analysis of Zero Group Cation

Test: Salt + NaOH → heat → NH₃ gas evolved (pungent smell; turns moist red litmus blue)

Nessler's Reagent test: NH₄Cl + NaOH →(Δ)→ NH₃ + NaCl + H₂O

  • NH₃ + Nessler's reagent (K₂HgI₄ + KOH) → yellow–brown precipitate (iodide of Millon's base)
  • [OHg₂NH₂]I (brown ppt.)

Paper soaked in CuSO₄ solution becomes deep blue due to complex with NH₃: CuSO₄ + 4NH₃ → [Cu(NH₃)₄]SO₄

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