To all using CALM:

CALM must be dissolved in HOT water. As "hot" and "warm" are both subjective terms, what is "warm" to some may not be hot enough for this process. The instructions do say hot, not warm and specify a minimum amount of water to use per dose:

http://www.calmnatural.com/natural-c...nesium-citrate
NOTE (unspecified on the label): the stuff is ready to drink after fizzing has stopped. at that point whatever you do to it - add hot, cold, or iced water, the magnesium citrate is stable.

two things happen here:
1. physical dissolution of anhydrous citric acid(one component of the powder) in water and
2. chemical reacion of the calcium carbonate with HOT citric acid, yielding calcium citrate in aqueous citric acid solution. this reaction produces "fizzing" because it releases carbon dioxide. so, fizzing tells you the reaction is not complete - that's why you need to wait till it stops before you drink up or do anything else to the preparation.

So then.... how hot does "hot" need to be?

At one point I'd found a chart that told me optimum solubility temps for bunches of salts in different solvents. Alas, I cannot find it again! What I do personally is heat water as though i were making instant coffee... i bring it to steam point but not to a full boil (as i would for tea). Then I add the stuff and then i let it cool down. that's probably hotter than needed but i am sure, that way, that as it cools it will certainly pass "through" critical solution temperature.

hope that's helpful and not too chem-geeky.

~ waves ~ a once-wannabe chem major