Scorodite(am)

Formula : FeAsO4:2H2O

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
230.797 72.100 (Ref.: 00bla/bid) Bladh K.W., Bideaux R.A., Anthony-Morton E., Nichols B.G. (2000) The Handbook of Mineralogy Volume IV, Mineralogical Society of America. -1269637 (Ref.: 06lan/mah) Langmuir D, Mahoney J, Rowson J (2006) Solubility products of amorphous ferric arsenate and crystalline scorodite (Fe- AsO4_2H2O) and their application to arsenic behavior in buried mine tailings. Geochim Cosmochim Acta 70:2942-2956
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

Scorodite(am) + 2H+ ⇌ H2AsO4- + Fe+3 + 2H2O

298.15 K, 1 bar log10K: -4.54 ΔH°r: J·mol-1 (Ref.: )
T(°C) 0 25 60 100 150 200 250 300
log10K -4.54 -4.54 -4.54 -4.54 -4.54 -4.54 -4.54 -4.54
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-4.537968 0.000000 0.000000 0.000000 0.000000