Nahcolite

Formula : NaHCO3

Family: 
Carbonates
Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: P 21/n
Dana class: 
13.1.1.1V - 13 Carbonate Minerals ; 13.1 Acid Carbonates with miscellaneous formulae ; 12.1.6

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
84.007 38.080 (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. -851156 (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. -949000 (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, 219-238 101.936 (Ref.: Internal calculation) 87.61 (Ref.: 74nau/ryz) Naumov G.B., Ryzhenko B.N., and Khodakovsky I.L., 1974. Handbook of Thermodynamic Data. U.S. Geol. Surv.WRD 74 001, 328 pp.
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.
87.61 0.00 0.00 (Ref.: 74nau/ryz) Naumov G.B., Ryzhenko B.N., and Khodakovsky I.L., 1974. Handbook of Thermodynamic Data. U.S. Geol. Surv.WRD 74 001, 328 pp.
Reaction properties

Nahcolite ⇌ HCO3- + Na+

298.15 K, 1 bar log10K: -0.41 ΔH°r:18730 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 -0.73 -0.41 -0.09 0.17 0.36 0.45 0.40 0.17
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-711.336655 -0.110206 38282.120135 259.186873 -2307525.935061