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Topic: CaSO4 - soluble in water or not?  (Read 29334 times)

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Offline NYM

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CaSO4 - soluble in water or not?
« on: April 05, 2008, 10:25:30 AM »
Is CaSO4 soluble in water? Wikipedia contradicts itself:

From http://en.wikipedia.org/wiki/Solubility#Solubility_of_ionic_compounds_in_water:
Soluble: sulfates (except Ag+, Pb2+, Ba2+, Sr2+ and Ca2+)

From http://en.wikipedia.org/wiki/Solubility_chart: Slightly soluble.

The same question with CuX2, where X is Cl-, Br- and I.

Thank you.

Offline Borek

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Re: CaSO4 - soluble in water or not?
« Reply #1 on: April 05, 2008, 10:35:47 AM »
That's because there are no totally insoluble salts. They all dissolve to some extent. Saturated solution of NaCl is close to 6M, saturated solution of AgI is arounf 10-9M if memory serves me well. CaSO4 is generally considered insoluble, but of many insoluble salts it is one of the best soluble ;)
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Offline NYM

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Re: CaSO4 - soluble in water or not?
« Reply #2 on: April 05, 2008, 01:05:37 PM »
Great, thanks!

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