H2SiO4-2

Formula : H2SiO4-2

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
94.099 -1176431 (Ref.: 01fel/cho) Felmy A. R., Cho H., Rustad J. R., and Mason M. J. (2001) An aqueous thermodynamic model for polymerized silica species to high ionic strength. Journal of Solution Chemistry 30(6), 509-525. -1383861 (Ref.: 92gre/fug) Grenthe I., Fuger J., Konings R.J.M., Lemire R.J., Muller A.B., Nguyen Trung C., and Wanner H., 1992. Chemical Thermodynamics, Volume 1: Chemical Thermodynamics of Uranium. North Holland, Amsterdam, 1, 714 pp. -5.250 (Ref.: Internal calculation)
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
Reaction properties

H4SiO4 ⇌ H2SiO4-2 + 2H+

298.15 K, 1 bar log10K: -23.27 ΔH°r:75000 J·mol-1 (Ref.: 92gre/fug) Grenthe I., Fuger J., Konings R.J.M., Lemire R.J., Muller A.B., Nguyen Trung C., and Wanner H., 1992. Chemical Thermodynamics, Volume 1: Chemical Thermodynamics of Uranium. North Holland, Amsterdam, 1, 714 pp.
T(°C) 0 25 60 100 150 200 250 300
log10K -24.52 -23.27 -22.00 -21.08 -20.50 -20.33 -20.42 -20.68
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
506.282365 0.042836 -34394.738644 -180.003223 1639456.021603