Erdite

Formula : NaFeS₂:2H₂O

Family:

Space group:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

Dernière mise à jour le 25.01.2021

Individual properties (298.15 K)

M g·mol^-1	V° cm³·mol^-1	ΔGº_f J·mol^-1	ΔHº_f J·mol^-1	Sº J·mol^-1·k^-1	C_P J·mol^-1·K^-1
178.999	80.740 (Ref.: 14las/pia) Lassin, A., Piantone, P., Crouzet, C., Bodenan, F., Blanc, P., 2014. Estimated thermodynamic properties of NaFeS2 and erdite (NaFeS2:2H2O). Applied Geochemistry 45, 14-24. doi:10.1016/j.apgeochem.2014.02.015	-809639 (Ref.: Internal calculation)	-930700 (Ref.: 14las/pia) Lassin, A., Piantone, P., Crouzet, C., Bodenan, F., Blanc, P., 2014. Estimated thermodynamic properties of NaFeS2 and erdite (NaFeS2:2H2O). Applied Geochemistry 45, 14-24. doi:10.1016/j.apgeochem.2014.02.015	203.200 (Ref.: 14las/pia) Lassin, A., Piantone, P., Crouzet, C., Bodenan, F., Blanc, P., 2014. Estimated thermodynamic properties of NaFeS2 and erdite (NaFeS2:2H2O). Applied Geochemistry 45, 14-24. doi:10.1016/j.apgeochem.2014.02.015	175.75 (Ref.: 14las/pia) Lassin, A., Piantone, P., Crouzet, C., Bodenan, F., Blanc, P., 2014. Estimated thermodynamic properties of NaFeS2 and erdite (NaFeS2:2H2O). Applied Geochemistry 45, 14-24. doi:10.1016/j.apgeochem.2014.02.015

C_P(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.
175.75	0.00	0.00	(Ref.: 14las/pia) Lassin, A., Piantone, P., Crouzet, C., Bodenan, F., Blanc, P., 2014. Estimated thermodynamic properties of NaFeS2 and erdite (NaFeS2:2H2O). Applied Geochemistry 45, 14-24. doi:10.1016/j.apgeochem.2014.02.015

Reaction properties

Erdite + 0.875H⁺ ⇌ Fe⁺² + Na⁺ + 1.875HS^- + 0.125SO₄^-²

298.15 K, 1 bar log₁₀K: -5.50 ΔH°_r:27385 J·mol^-1

T(°C)	0	25	60	100	150	200	250	300
log₁₀K	-6.00	-5.50	-5.06	-4.80	-4.72	-4.89	-5.35	-6.24

log₁₀K(T) = A + B·T + C·T^-1 + D·log₁₀(T) + E·T⁻² (T in Kelvin)

A	B	C	D	E
-1807.489490	-0.283493	97609.895228	656.645862	-5840246.818274