> Thanks for that. Would CaCl2 turn entirely liquid with just moisture 
> from the air ? 

AFAIK yes

> What would be a household test for CaCl2 ?

Test Ca2+ : dissolve a little in water, bubble your breath trough it.
The solution should become opaque white.

Testing Cl- is more difficult, silvernitrate would be suitable but not
exactly a household chemical. You could rub some solution on your hands.
If it feels soapy the negative ion is a weak acid, Cl- is strong. If it
does not feel soapy the most likely negative ions are Cl- and NO3-. I
don't think Ca(NO3)2 is hygroscopic, at least not as much as CaCl2.

Wouter van Ooijen

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