मराठी

Confirmatory Test for Anions

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Estimated time: 4 minutes
CBSE: Class 12

Key Points: Confirmatory Tests for Anions

Anion Confirmatory Test Observation
CO₃²⁻ Add MgSO₄ to the water extract White precipitate
SO₃²⁻ Add BaCl₂ to water extract → add dil. HCl White ppt. disappears on adding HCl
S²⁻ (i) Sodium nitroprusside (ii) Lead acetate (i) Purple/violet (ii) Black precipitate
NO₂⁻ Boil with dil. H₂SO₄ + KI + starch Deep blue colour
Cl⁻ AgNO₃ to water extract White ppt. soluble in NH₄OH
Br⁻ AgNO₃ to water extract Yellow ppt. partially soluble in NH₄OH
I⁻ AgNO₃ to water extract Yellow ppt. insoluble in NH₄OH
NO₃⁻ FeSO₄ solution + one drop conc. H₂SO₄ (side of test tube) Brown ring at the junction
CH₃COO⁻ Conc. H₂SO₄ + ethanol Fruity smell (ester formation)
C₂O₄²⁻ Acetic acid + CaCl₂ → water extract White ppt. dissolves in dil. HNO₃
SO₄²⁻ BaCl₂ to water extract White ppt. insoluble in conc. HCl
PO₄³⁻ dil. HNO₃ + ammonium molybdate + boil Yellow crystalline ppt.
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