77% Calcium Chloride

[Jye]

Does anyone who uses 77% CaCl multiply their water addition by 1.3 to get a 100% water addition?

 

[Jye]

No one else uses 77% CaCl?

 

[drsmurto]

Assuming you are using CaCl2.2H2O not CaCl

and that the 77% refers to the total content of CaCl2.

Then yes, multiply by ~1.3 to account for the 2 water molecules.

 

[Jye]

Thanks Dr

Its the stuff available from CB and Im guessing its CaCl2.2H2O. Is it possible to get just CaCl2?

 

[drsmurto]

Yes. CaCl2 (anhydrous).

Only problem is it absorbs water very readily so you need to store it in a sealed container, preferably under an inert atmosphere or in the presence of a desiccant. Neither are practical for most HBers....

As long as you allow for the 2 water molecules in your calcs you are fine using the dihydrate.

Pretty sure the stuff i have is the dihydrate.

Easy way to check - the dihydrate will look like salt crystals, the anyhdrous will look like flour.

 

[Jye]

Easy way to check - the dihydrate will look like salt crystals, the anyhdrous will look like flour.

Too easy... looks like its dihydrate :icon_cheers:

 

[Bribie G]

I must have the dihydrate as well, bought it in December and I was wondering why it hasn't degenerated into a soggy mess yet