May 30, 2020, 11:04:55 PM
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Topic: Any shortcut on finding solubility of complex salts that hydrolyse?  (Read 782 times)

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Offline SinkingTako

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Take for example copper phosphate, Cu3(PO4)2. It hydrolyse in water to give like HPO42-, H2PO4-, and a bit of Cu(OH)+.

The only simplification I can make is really assume that the main species are HPO42-, PO43-, Cu2+ and Cu(OH)+, then manipulate the mass charge balance equations, after a bit of ugly and nasty math, find the pH of the solution, and thus solubility.

So are there any tips? Like what kind of simplification can you make, or what specific equations to use? Thanks so much!

Erm not chem buddy, or any software of course... With a good, old scientific calculator:)

And for anyone interested, Ksp Cu3(PO4)2 =1.3 x 10-37
pKa Cu2+ = 8
pKa Phosphoric acid = 2.15, 7.09, 12.32

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