Dawsonite

Formula : NaAlCO3(OH)2

Family: 
Carbonates
Space group: 
Orthorhombic - Dipyramidal HM symbol (2/m 2/m 2/m) Space Group: Imam
Dana class: 
16a.3.8.1V - 16a Carbonates - Hydroxyl or Halogen ; 16a.3 Carbonates - Hydroxyl or Halogen where (A B)2 (XO3) Zq ; 16a.3.3

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
143.995 59.300 (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. -1786034 (Ref.: Internal calculation) -1964000 (Ref.: 76fer/stu) Ferrante M.J., Stuve J.M. and Richardson D.W., 1976. Thermodynamic data for synthetic dawsonite. U.S. Bur. Mines Rept. Inv., 5, 577-582 132.000 (Ref.: 76fer/stu) Ferrante M.J., Stuve J.M. and Richardson D.W., 1976. Thermodynamic data for synthetic dawsonite. U.S. Bur. Mines Rept. Inv., 5, 577-582 142.59 (Ref.: 76fer/stu) Ferrante M.J., Stuve J.M. and Richardson D.W., 1976. Thermodynamic data for synthetic dawsonite. U.S. Bur. Mines Rept. Inv., 5, 577-582
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.
142.59 0.00 0.00 (Ref.: 76fer/stu) Ferrante M.J., Stuve J.M. and Richardson D.W., 1976. Thermodynamic data for synthetic dawsonite. U.S. Bur. Mines Rept. Inv., 5, 577-582
Reaction properties

Dawsonite + 3H+ ⇌ Al+3 + HCO3- + Na+ + 2H2O

298.15 K, 1 bar log10K: 4.33 ΔH°r:-76330 J·mol-1 (Ref.: 76fer/stu) Ferrante M.J., Stuve J.M. and Richardson D.W., 1976. Thermodynamic data for synthetic dawsonite. U.S. Bur. Mines Rept. Inv., 5, 577-582
T(°C) 0 25 60 100 150 200 250 300
log10K 5.52 4.33 2.89 1.53 0.10 -1.18 -2.43 -3.80
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1215.989999 -0.191108 68919.359428 439.700176 -3722030.691596