When excess aqueous ammonia is added to copper(II)sulphate (aq), the initial pale blue precipitate dissolves to give a __________ solution. Please fill in this blank by using the missing colour.

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A deep blue solution would be formed.  Adding excess ammonia allows the precipate to dissolve.  The Copper combines with the ammonia to form Tetraamminediaquacopper(II) which is deep blue.

         

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