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Topic: Reaction of Copper Sulfate and ammonia .  (Read 6149 times)

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Offline AdiDex

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Reaction of Copper Sulfate and ammonia .
« on: January 07, 2017, 09:35:40 AM »
We've done preparation of Tetraamminecopper(II) sulphate [Cu(NH3)4(H2O)n]SO4 using copper sulphate and 50% ammonia solution. Initially, a pale blue colour of Cu(OH)2 appeared with turbidity then after a dark blue colour solution is obtained. It is a substitution reaction.

Initially, why formation of Cu(OH)2 is taking place ??

Is NH3  acting as base and ripping off the proton from the complex [Cu(H2O)6]2+ ? Then on the further increment of the concentration of NH3, it starts to act as Nucleophile?? My high school teacher taught me that acid-base reactions are always fast, so in this example is everything is about kinetics? What is the role of the thermodynamics? From where can I get a quantitative explanation with proper data?

Offline Borek

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Re: Reaction of Copper Sulfate and ammonia .
« Reply #1 on: January 07, 2017, 12:41:33 PM »
Google for copper hydroxide solubility product and amine copper complexes stability constants.

It is all about thermodynamics, no kinetics required to explain these observations.
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