Si4O8(OH)4-4

Formula : Si4O8(OH)4-4

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
308.367 -4065282 (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. -4585611 (Ref.: Internal calculation) 83.680 (Ref.: 17bbla) Blanc P. (2017) - Thermoddem : Update for the 2017 version. Report BRGM/RP-66811-FR, 20 p.
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

4H4SiO4 ⇌ Si4O8(OH)4-4 + 4H2O + 4H+

298.15 K, 1 bar log10K: -39.10 ΔH°r:106512 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K -40.82 -39.10 -37.28 -36.05 -35.44 -35.54 -36.07 -36.83
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
1733.203159 0.171615 -113676.692213 -612.732312 6575749.632837