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Author: Subject: Reaction of calcium sulfate hemihydrate and sodium bicarbonate
TriiodideFrog
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[*] posted on 26-11-2020 at 18:37
Reaction of calcium sulfate hemihydrate and sodium bicarbonate

Hi

Does anyone know why calcium sulfate hemihydrate and sodium bicarbonate react in water? Some gas is formed but I do not know what type of gas it is.
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Bedlasky
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[*] posted on 26-11-2020 at 19:12


Gas is CO2.

But I would be surprised if CaSO4 will react with NaHCO3, because Ca(HCO3)2 is more soluble than CaSO4. Did you heat up a mixture? If yes, NaHCO3 decompose in to Na2CO3, CO2 and H2O. Na2CO3 then react with CaSO4 to form CaCO3 and Na2SO4.



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