
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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CATEGORIES Inorganic chemistry questions
TAGS Dr. Bbosa Science