Coordination Compounds

Coordination Compounds

Question

On  adding  NaOH  to  ammonium  sulphate,  a  colourless  gas  with  pungent  odour  is evolved, which forms a blue-coloured complex with Cu2+ ion. Identify the gas.

Answer

On adding NaOH to ammonium sulphate, ammonia gas is evolved. It has a pungent odour and forms a blue-coloured complex with the Cu2+ ion. The chemical reactions are as:
left parenthesis NH subscript 4 right parenthesis subscript 2 SO subscript 4 space plus 2 NaOH space rightwards arrow space 2 NH subscript 3 space plus Na subscript 2 SO subscript 4 space plus 2 straight H subscript 2 straight O
4 space NH subscript 3 space plus Cu to the power of 2 plus end exponent space rightwards harpoon over leftwards harpoon space left square bracket Cu left parenthesis NH subscript 3 right parenthesis subscript 4 right square bracket to the power of 2 plus end exponent space left parenthesis aq right parenthesis

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