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Author: Subject: Sodium Carbonate - strange stuff! Dissolved in room temp H2O then crystalized
RogueRose
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[*] posted on 24-4-2016 at 13:30
Sodium Carbonate - strange stuff! Dissolved in room temp H2O then crystalized


I'm not exactly sure what's going on with the sodium carbonate but I added 15g to 40ml of water and it dissolved while heating up the water. After about 4 hours, it almost all crystalized into clearish crystals while the starting crystals where solid white (I'm 99% sure it was monohydrate).

I'm guessing it converted to some other hydrate, not sure which, but is there a way to get it to dissolve back into the water without adding a lot more water? This stuff is hard to figure out b/c some of it dissolves better at higher temps, others at lower temp.

[Edited on 24-4-2016 by RogueRose]
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solitanze
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[*] posted on 24-4-2016 at 13:50


From the sodium carbonate/water phase diagram, what you have is the decahydrate.

Heat the solution a little and it should dissolve again.
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