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Question:

How does ammonia react with a solution of Cu2+?

Answer:

Ammonia acts as a Lewis base due to the presence of lone pair of electrons on the nitrogen atom.Therefore,it can form coordinate bond with electron deficient molecules or a number of transition metal cations to from complex compounds.Ammonia reacts with a solution of Cu2+ to from a deep blue coloured complex.The reaction for the above complex can be written as follows:

Cu2+(aq) + 4 NH3(aq)   ⇔  [Cu(NH3)4]2+(aq)

Blue                                         Deep Blue

This property of ammonia to form complex compounds is useful in detection of metal ions.

 


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