A2 metal aqua ions/ligand substitution.

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VioletPhillippo
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Hi,

Please could someone explain what happens in the reaction between copper(2) aqua ions and excess ammonia.

I've done one question where they've added NH3 drop wise and then in excess (to the copper(2) hydroxide formed in the 1st reaction.

I've done another question where it just says NH3 is added in excess and it's started with (Cu (H20)6)2+ which obviously gives a different equation.

There's also a question about Fe (3) with excess NH3 which says write an equation, do you just assume that the ppt doesn't dissolve so therefore no reaction?

Then the revision guide gives a different equation which I don't understand, particularly the starting species.

Thanks
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rosemondtan
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If it's dropwise you'll form a compound of [Cu(H2O)4(OH)2] which is insoluble but if NH3 is added in excess it'll skip over this insoluble product as the product will dissolve in excess to form [Cu(NH3)6]2+ ! With Fe3+ yep there's no change
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