Leonhardtite

Formula : MgSO4:4H2O

Family: 
Sulfates

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
192.430 81.860 (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. -2153021 (Ref.: 80har/wea) Harvie C.E., and Weare J.H., 1980. The prediction of mineral soluhilities in natural waters: the Na K Mg Ca Cl SO4 H2O system from zero to high concentration at 25C. Geochimica et Cosmochimica Acta, 44, p. 981 997. -2495630 (Ref.: 74nau/ryz) Naumov G.B., Ryzhenko B.N., and Khodakovsky I.L., 1974. Handbook of Thermodynamic Data. U.S. Geol. Surv.WRD 74 001, 328 pp. 258.936 (Ref.: Internal calculation)
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.
Reaction properties

Leonhardtite ⇌ Mg+2 + SO4-2 + 4H2O

298.15 K, 1 bar log10K: -0.89 ΔH°r:-24030 J·mol-1 (Ref.: 74nau/ryz) Naumov G.B., Ryzhenko B.N., and Khodakovsky I.L., 1974. Handbook of Thermodynamic Data. U.S. Geol. Surv.WRD 74 001, 328 pp.
T(°C) 0 25 60 100 150 200 250 300
log10K -0.51 -0.89 -1.31 -1.64 -1.93 -2.19 -2.54 -3.19
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1800.939603 -0.264510 99216.757871 650.103228 -5555435.331190