CaCl2:2H2O

Formula : CaCl2:2H2O

Family: 
Chlorides
Space group: 
Tetragonal Space Group: Unk.
Dana class: 
9.2.5.1IV- 9 Halide Minerals ; 9.2 Anhydrous and Hydrated Halides where A(?)2 ; 9.2.4
High temperature: 
Stable at room temperature. The structure is very responsive in temperature and/or water-vapor pressure (Sinjarite)
Geological context: 
In the natural environment known as hydrophilite. Occurs as product from volcanic fumaroles.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
147.013 91.875 (Ref.: 63wyc) Wyckoff, R.W.G., 1963, Crystal Structures, Second edition, tome 4, Interscience Publishers, New York, p. 320-322. -1244146 (Ref.: Internal calculation) -1404030 (Ref.: 87gar/par) CODATA87 Garvin D., Parker V.B and White H.J., 1987. CODATA Series on Thermodynamic Properties, Hemisphere, Washington, DC. 194.930 (Ref.: 87gar/par) CODATA87 Garvin D., Parker V.B and White H.J., 1987. CODATA Series on Thermodynamic Properties, Hemisphere, Washington, DC.
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
Reaction properties

CaCl2:2H2O ⇌ Ca+2 + 2Cl- + 2H2O

298.15 K, 1 bar log10K: 7.95 ΔH°r:-44790 J·mol-1 (Ref.: 87gar/par) CODATA87 Garvin D., Parker V.B and White H.J., 1987. CODATA Series on Thermodynamic Properties, Hemisphere, Washington, DC.
T(°C) 0 25 60 100 150 200 250 300
log10K 8.64 7.95 7.10 6.26 5.33 4.45 3.49 2.28
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1555.851029 -0.242354 86627.587320 565.808886 -4848860.976523