H3AsO4

Formula : H3AsO4

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
141.943 52.839 (Ref.: 08per/pok) Perfetti E., Pokrovski G., Ballerat-Busserolles K., Majer V., Gibert F. (2008) Densities and heat capacities of aqueous arsenious and arsenic acid solutions to 350 C and 300 bar, and revised thermodynamic properties of As(OH)3(aq), AsO(OH)3(aq) and iron sulfarsenide minerals. Geochimica et Cosmochimica Acta 72, 713-731 -766300 (Ref.: 08per/pok) Perfetti E., Pokrovski G., Ballerat-Busserolles K., Majer V., Gibert F. (2008) Densities and heat capacities of aqueous arsenious and arsenic acid solutions to 350 C and 300 bar, and revised thermodynamic properties of As(OH)3(aq), AsO(OH)3(aq) and iron sulfarsenide minerals. Geochimica et Cosmochimica Acta 72, 713-731 -898593 (Ref.: Internal calculation) 198.300 (Ref.: 08per/pok) Perfetti E., Pokrovski G., Ballerat-Busserolles K., Majer V., Gibert F. (2008) Densities and heat capacities of aqueous arsenious and arsenic acid solutions to 350 C and 300 bar, and revised thermodynamic properties of As(OH)3(aq), AsO(OH)3(aq) and iron sulfarsenide minerals. Geochimica et Cosmochimica Acta 72, 713-731 113.15 (Ref.: 08per/pok) Perfetti E., Pokrovski G., Ballerat-Busserolles K., Majer V., Gibert F. (2008) Densities and heat capacities of aqueous arsenious and arsenic acid solutions to 350 C and 300 bar, and revised thermodynamic properties of As(OH)3(aq), AsO(OH)3(aq) and iron sulfarsenide minerals. Geochimica et Cosmochimica Acta 72, 713-731
HKF coefficients
a1·10
J·mol-1·bar-1
 a2·10-2
J·mol-1
 a3
J·K·mol-1·bar-1
 a4·10-4
J·K·mol-1
 c1
J·mol-1·K-1
 c2·10-4
J·K·mol-1
 ω·10-5
J·mol-1
48.1000 11.7000 54.4000 -12.6000 198.7000 -42.1000 1.0000
Reaction properties

H2AsO4- + H+ ⇌ H3AsO4

298.15 K, 1 bar log10K: 2.30 ΔH°r:11056 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 2.14 2.30 2.54 2.85 3.29 3.77 4.30 4.91
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
163.157981 0.040730 -7354.609812 -61.578275 359038.599972