मराठी

Analysis of Cations

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Analysis of Cations

Group Cations Group Reagent Precipitate Colour
0 (Zero) NH₄⁺ Dil. NaOH (heat) NH₃ gas (no ppt.)
I Pb²⁺, Ag⁺, Hg₂²⁺ Dil. HCl White (PbCl₂, AgCl, Hg₂Cl₂)
IIA Hg²⁺, Pb²⁺, Bi³⁺, Cu²⁺, Cd²⁺ H₂S in presence of dil. HCl Black (HgS, PbS, Bi₂S₃, CuS), Yellow (CdS)
IIB As³⁺, Sb³⁺, Sn²⁺, Sn⁴⁺ H₂S in presence of dil. HCl Yellow (As₂S₃), Orange (Sb₂S₃), Brown (SnS), Yellow (SnS₂)
III Fe³⁺, Al³⁺, Cr³⁺ NH₄OH in presence of NH₄Cl Red-brown [Fe(OH)₃], White [Al(OH)₃], Green [Cr(OH)₃]
IV Co²⁺, Ni²⁺, Mn²⁺, Zn²⁺ H₂S in presence of NH₄OH Black (CoS, NiS), Buff/Dirty pink (MnS), White (ZnS)
V Ca²⁺, Sr²⁺, Ba²⁺ (NH₄)₂CO₃ in presence of NH₄OH White (CaCO₃, SrCO₃, BaCO₃)
VI Mg²⁺ Na₂HPO₄ White [Mg(NH₄)PO₄]
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