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Mineral speciesFormula
 CaCl2:H2OCaCl2:H2O 
Mineralogy
Geological context
High temperature: Stable at room temperature. The structure is very responsive in temperature and/or water-vapor pressure 
Geological context: In the natural environment known as hydrophilite. Occurs as product from volcanic fumaroles. 
Thermodynamics
Individual properties
Molar weight: 128.998 g/mol  ΔGºf-1,007,588 J/mol ref.  Sº: 151.65 J/mol/K ref. 
  ΔHºf-1,110,830 J/mol ref.   
Reaction properties
Chemical reaction:  CaCl2:H2O = Ca+2 + 2Cl- + H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.55512172e+3   -2.46249424e-1   8.71028672e+4   5.65610753e+2   -4.91771982e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)7.85
ΔH°r-52,160 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  8.64   7.85   6.84   5.80   4.63   3.50   2.30   0.85 

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