Crocoite

Formula : PbCrO4

Family: 
Chromate
Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: P 21/n
Dana class: 
35.3.1.1VI- 35 Anhydrous Chromates ; 35.3 Anhydrous Chromates where A+ XO4 ; 34.8.1

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
323.164 52.810 (Ref.: 00lyd) Lyde D.R., 2000. CRC Handbook of Chemistry and Physics, 2000-200. CRC Press -820073 (Ref.: 42kol/per) Koltoff I.M., Perlich R.W. and Weiblen D., 1942. Solubility of lead sulfate and lead oxalate in various media. J. Phys. Chem, 46, p. 561. -927020 (Ref.: 76del/hep) Dellien I. and Hepler L.G., 1976b. Enthalpies of formation of Cr3+(aq) and the inner sphere complexes CrF2+(aq), CrCl2+(aq), CrBr2+(aq), and CrSO4+(aq). Can. J. Chem., 54, p.1383-1387. 140.021 (Ref.: Internal calculation) 121.75 (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.
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.
121.75 0.00 0.00 (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.
Reaction properties

Crocoite ⇌ CrO4-2 + Pb+2

298.15 K, 1 bar log10K: -12.55 ΔH°r:48940 J·mol-1 (Ref.: 76del/hep) Dellien I. and Hepler L.G., 1976b. Enthalpies of formation of Cr3+(aq) and the inner sphere complexes CrF2+(aq), CrCl2+(aq), CrBr2+(aq), and CrSO4+(aq). Can. J. Chem., 54, p.1383-1387.
T(°C) 0 25 60 100 150 200 250 300
log10K -13.43 -12.55 -11.77 -11.29 -11.11 -11.29 -11.81 -12.77
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1570.860901 -0.253306 84654.283431 569.874111 -5352650.007707