Qualitative analysis f nickel II ions

Qualitative analysis f nickel II ions

Common nickel II salts

Nickel (II) sulphate, NiSO₄.7H₂O

Nickel (II) carbonate, NiCO₃

(NH₄)₂SO₄.NiSO₄.6H₂O

Addition of dilute sodium hydroxide to nickel II ions

Forms a green precipitate insoluble in excess

Ni²⁺ (aq) + 2OH^– (aq)  → Ni (OH)₂ (s)

Addition of dilute ammonia solution to nickel II ions

Forms a green precipitate soluble in excess

Ni²⁺ (aq) + 2OH^– (aq)  → Ni (OH)₂ (s)

Then

Ni(OH)₂(s) + 6NH3(aq) → Ni(NH₃)₆²⁺

Confirming Ni²⁺ ions

Forms a pink ppt on addition of a few drops of ammonia followed by dimethylglyoxime.

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