Claudetite

Formula : As2O3

Family: 
Oxides
Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: P 21/n
Dana class: 
4.3.10.1III - 4 Oxide Minerals ; 4.3 Simple Oxides with a cation charge of 3+ (A+++2 O3) ; 4.3.10

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
197.841 47.260 (Ref.: 96pok/gou) Pokrovski G., Gout R., Schott J., Zotov A. and Harrichoury J.C., 1996. Thermodynamic properties and stoichiometry of As (III) hydroxide complexes at hydrothermal conditions. Geochimica et Cosmochimica Acta, 60, 737-749 -576262 (Ref.: 96pok/gou) Pokrovski G., Gout R., Schott J., Zotov A. and Harrichoury J.C., 1996. Thermodynamic properties and stoichiometry of As (III) hydroxide complexes at hydrothermal conditions. Geochimica et Cosmochimica Acta, 60, 737-749 -655500 (Ref.: Internal calculation) 113.345 (Ref.: 96pok/gou) Pokrovski G., Gout R., Schott J., Zotov A. and Harrichoury J.C., 1996. Thermodynamic properties and stoichiometry of As (III) hydroxide complexes at hydrothermal conditions. Geochimica et Cosmochimica Acta, 60, 737-749 97.04 (Ref.: 96pok/gou) Pokrovski G., Gout R., Schott J., Zotov A. and Harrichoury J.C., 1996. Thermodynamic properties and stoichiometry of As (III) hydroxide complexes at hydrothermal conditions. Geochimica et Cosmochimica Acta, 60, 737-749
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.
99.83 44.94 -14.39 (Ref.: 96pok/gou) Pokrovski G., Gout R., Schott J., Zotov A. and Harrichoury J.C., 1996. Thermodynamic properties and stoichiometry of As (III) hydroxide complexes at hydrothermal conditions. Geochimica et Cosmochimica Acta, 60, 737-749
Reaction properties

Claudetite + 3H2O ⇌ 2H2AsO3- + 2H+

298.15 K, 1 bar log10K: -19.93 ΔH°r:94727 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K -21.43 -19.93 -18.18 -16.58 -15.07 -13.97 -13.22 -12.84
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-492.884453 -0.091503 17342.082552 183.179816 -995270.925557