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Mineral speciesFormula
 CaCl2:4H2OCaCl2:4H2O 
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: 183.044 g/mol  ΔGºf-1,733,240 J/mol ref.  Sº: 272.22 J/mol/K ref. 
  ΔHºf-2,009,170 J/mol ref.   
Reaction properties
Chemical reaction:  CaCl2:4H2O = Ca+2 + 2Cl- + 4H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.60076200e+3   -2.41697924e-1   8.69740027e+4   5.82295689e+2   -4.83420137e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)5.36
ΔH°r-11,310 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  5.54   5.36   5.17   5.03   4.90   4.74   4.46   3.87 

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