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[Cu(H2O)6]2+ is light blue, by adding NH3 to the hexahydro species, it forms [Cu(NH3)4]2+ and the colour turns dark blue, why?




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When hexaaquacopper ion is treated with ammonia it forms [cu(nh3)4(h20)2]+2 not [cu(nh3)4]+2, please correct your question. let me know if you have any objections. thank you
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It is because of d-d transition

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