Aqueous Cu2+\text{Cu}^{2+}Cu2+ ions are reacted with an excess of aqueous ammonia.
Which product is responsible for the deep blue solution formed?
[Cu(NH3)4(H2O)2]2+[\text{Cu}(\text{NH}_3)_4(\text{H}_2\text{O})_2]^{2+}[Cu(NH3)4(H2O)2]2+
Cu(OH)2\text{Cu}(\text{OH})_2Cu(OH)2
[Cu(NH3)6]2+[\text{Cu}(\text{NH}_3)_6]^{2+}[Cu(NH3)6]2+
[Cu(OH)4]2−[\text{Cu}(\text{OH})_4]^{2-}[Cu(OH)4]2−
