Gaylussite

Formula : CaNa2(CO3)2:5H2O

Family: 
Carbonates
Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: I2/a
Dana class: 
15.2.2.1V - 15 Hydrated Carbonates ; 15.2 Hydrated Carbonates where A+m B++n (XO3)p . x(H2O), (m+n):p > 1:1 ; 15.2.1

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
296.152 148.820 (Ref.: 63wyc) Wyckoff, R.W.G., 1963, Crystal Structures, Second edition, tome 4, Interscience Publishers, New York, p. 320-322. -3372037 (Ref.: 99kon/kon) Konigsberger E., Konisberger L.C., and Gamsjager H., 1999. Low temperature thermodynamic model for the system Na2CO3 MgCO3 CaCO3 H2O. Geochimica et Cosmochimica Acta, 63, p. 3105-3119. -3834386 (Ref.: Internal calculation) 386.680 (Ref.: 99kon/kon) Konigsberger E., Konisberger L.C., and Gamsjager H., 1999. Low temperature thermodynamic model for the system Na2CO3 MgCO3 CaCO3 H2O. Geochimica et Cosmochimica Acta, 63, p. 3105-3119.
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

Gaylussite + 2H+ ⇌ 2HCO3- + Ca+2 + 2Na+ + 5H2O

298.15 K, 1 bar log10K: 11.23 ΔH°r:1696 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 11.27 11.23 11.38 11.77 12.42 13.10 13.67 13.92
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1846.694713 -0.259903 99461.219601 671.516420 -5316217.106084