Hopeite(beta)

Formula : Zn3(PO4)2:4H2O

Family: 
Phosphates
Space group: 
Orthorhombic - Dipyramidal HM symbol (2/m 2/m 2/m) Space Group: P nma
Dana class: 
40.3.4.1VII - 40 Hydrated Phosphates, etc ; 40.3 Hydrated Phosphates, etc where (A++)3 (XO4)2 . x(H2O) ; 40.3.4

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
458.174 146.827 (Ref.: 63wyc) Wyckoff, R.W.G., 1963, Crystal Structures, Second edition, tome 4, Interscience Publishers, New York, p. 320-322. -3616400 (Ref.: 84vie/tar) Vieillard P., Tardy Y., 1984, Thermochemical properties of phosphates, Chap. 4. In: Phosphate Minerals, J.O. Nriagu and P.B. Moore (Eds), Springer-Verlag, New York, ISBN 3-540-12757-7, 171-198 -4091500 (Ref.: 79vol) Volkov A.I., 1979, Thermochemical study of 3d element orthophosphates. Khim. Khim. Tekhnol. (Minsk), 14, 58-64 (in russian) 367.470 (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

Hopeite(beta) + 4H+ ⇌ 2H2PO4- + 3Zn+2 + 4H2O

298.15 K, 1 bar log10K: 8.44 ΔH°r:-117176 J·mol-1 (Ref.: 79vol) Volkov A.I., 1979, Thermochemical study of 3d element orthophosphates. Khim. Khim. Tekhnol. (Minsk), 14, 58-64 (in russian)
T(°C) 0 25 60 100 150 200 250 300
log10K 10.35 8.44 6.35 4.59 2.99 1.73 0.56 -0.83
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2303.761103 -0.338592 128761.463449 831.241593 -6717708.543048