Question

Coloured in organic salt b identify cationic and anionic radicl onthe basic of wet and dry

Answer 1

Hey!!
Dry test means testing a substance by its physical properties like colour, density, etc.
Wet test means testing a substance by adding suitable reagents.

Add little Sodium hydroxide(NaOH) solution into the given salt.
If the salt contains the following cations, the following coloured precipitates are obtained:
Copper: Pale blue
Ferrous: Dirty green
Ferric: Yellowish brown
Zinc: Gelatinous white
Lead: Chalky white
Calcium: Curdy white
Magnesium: Milky white
Aluminium: Shiny white

On adding excess sodium hydroxide solution, the white precipitates of zinc, lead and aluminium dissolves; others do not.

Now to test for anions, add silver nitrate solution on the given salt.
If a white precipitate (of AgCl) is obtained which dissolves in excess ammonia solution, then Chloride ion is present.

Add Barium Chloride solution. If a white precipitate (of BaSO4) is obtained, which is insoluble in mineral acids, then the salt contains Sulphate radical.

Add freshly prepared ferrous sulphate solution with conc. H2SO4 into the given salt solution. If a brown ring (of Nitroso Ferrous Sulphate) appears, the salt contains Nitrate ions. Thanks....

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