Thermonatrite

Formula : Na2CO3:H2O

Family: 
Carbonates
Space group: 
Orthorhombic - Pyramidal HM symbol (mm2) Space Group: P ca21
Dana class: 
15.1.1.1V - 15 Hydrated Carbonates ; 15.1 Hydrated Carbonates where A+ (XO3) . x(H2O) ; 14.4.6

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
124.004 54.990 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp. -1286205 (Ref.: 84har/mol) Harvie C.E., Moller N., and Weare J.H.. 1984, The prediction of mineral solubilities in natural waters: The Na-K-Mg-Ca-H-Cl-SO4-OH-HCO3-CO3-CO2-H2O system to high ionic strengths at 25 C. Geochimica Cosmochimica Acta, 48, pp. 723-751. -1429700 (Ref.: 82van) Vanderzee C.E., 1982. Thermodynamic relations and equilibria in (Na2CO3 + NaHCO3 + H2O): Standard Gibbs energies of formation and other properties of sodium hydrogen carbonate, sodium carbonate heptahydrate, sodium carbonate decahydrate, trona: (Na2CO3CNaHCO3C2H2O), and Wegscheider's salt: (Na2CO3C3NaHCO3). J. Chem. Thermodynamics, 14, 219-238 168.038 (Ref.: Internal calculation) 148.71 (Ref.: 82van) Vanderzee C.E., 1982. Thermodynamic relations and equilibria in (Na2CO3 + NaHCO3 + H2O): Standard Gibbs energies of formation and other properties of sodium hydrogen carbonate, sodium carbonate heptahydrate, sodium carbonate decahydrate, trona: (Na2CO3CNaHCO3C2H2O), and Wegscheider's salt: (Na2CO3C3NaHCO3). J. Chem. Thermodynamics, 14, 219-238
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.
148.71 0.00 0.00 (Ref.: 82van) Vanderzee C.E., 1982. Thermodynamic relations and equilibria in (Na2CO3 + NaHCO3 + H2O): Standard Gibbs energies of formation and other properties of sodium hydrogen carbonate, sodium carbonate heptahydrate, sodium carbonate decahydrate, trona: (Na2CO3CNaHCO3C2H2O), and Wegscheider's salt: (Na2CO3C3NaHCO3). J. Chem. Thermodynamics, 14, 219-238
Reaction properties

Thermonatrite + H+ ⇌ HCO3- + 2Na+ + H2O

298.15 K, 1 bar log10K: 10.81 ΔH°r:-26740 J·mol-1 (Ref.: 82van) Vanderzee C.E., 1982. Thermodynamic relations and equilibria in (Na2CO3 + NaHCO3 + H2O): Standard Gibbs energies of formation and other properties of sodium hydrogen carbonate, sodium carbonate heptahydrate, sodium carbonate decahydrate, trona: (Na2CO3CNaHCO3C2H2O), and Wegscheider's salt: (Na2CO3C3NaHCO3). J. Chem. Thermodynamics, 14, 219-238
T(°C) 0 25 60 100 150 200 250 300
log10K 11.23 10.81 10.31 9.86 9.41 9.02 8.61 8.10
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-850.856492 -0.127416 48473.539165 310.221486 -2715731.753267