Calcium Chloride CaCl2 compared to CaCl2 6H2O

[simon12]

I ran out of Calcium Chloride flake and ordered just Calcium Chloride on Ebay, I received a crystal version thats CaCl2 6H2O. Its along time since I did any chemistry but I looked at the atomic mass of the atoms on the period table and came up with CaCl2 40+35.5+35.5=111 and 6H2O 6(1=1=16)=108 so I think I need to use roughly double compared to pure CaCl2. Is this correct or have I got something wrong?

[Hanglow]

Funny, I was just reading a thread on HBT about the different CaCl2

"The monohydrate is 86% calcium chloride (assuming no impurities other than water), the dihidrate 75.5% calcium chloride and the hexahydrate only 50.7%. Correspondingly greater amounts of these salts are needed to supply 10 grams of actual CaCl2. A product with 80% calcium chloride content, assuming again that the rest is mostly water, apparently is a mix of mono and di hydrates.
"

http://www.homebrewtalk.com/showthread.php?t=501377


I don't know if that helps

[Aleman]

Yep that's true.

Something that few calculators take account of . . . And certainly do not specify which version of the salt you need to use

[rpt]

I use the Brewer's Friend water calculator. For all salts it makes it clear which hydrate it is assuming. For calcium chloride it is the dihydrate.

[simon12]

Cheers guys.