Monetite

Formula : CaHPO4

Family: 
Phosphates
Space group: 
Triclinic Pedial or Pinacoidal HM symbol (1 or -1) Space Group: P1
Dana class: 
37.1.1.14 2m ; 37.1 Anhydrous Acid Phosphates, etc with miscellaneous formulae ; 37.1.1

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
136.057 46.450 (Ref.: 84nri) Nriagu J.O., 1984, Formation and stability of base metal phosphates in soils and sediments, Chap. 10. In: Phosphate Minerals, J.O. Nriagu and P.B. Moore (Eds), Springer-Verlag, ISBN 3-540-12757-7, 318-329 -1688246 (Ref.: 84nan) Nancollas G.H., 1984, The nucleation and growth of phosphate minerals, Chap. 2. In: Phosphate Minerals, J.O. Nriagu and P.B. Moore (Eds), Springer-Verlag, ISBN 3-540-12757-7, 318-329 -1821502 (Ref.: Internal calculation) 111.380 (Ref.: 84nan) Nancollas G.H., 1984, The nucleation and growth of phosphate minerals, Chap. 2. In: Phosphate Minerals, J.O. Nriagu and P.B. Moore (Eds), Springer-Verlag, ISBN 3-540-12757-7, 318-329 111.60 (Ref.: 70gre/mor, after 64a,bega/wak)
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.
44.31 233.43 -2.05 (Ref.: 70gre/mor, after 64a,bega/wak)
Reaction properties

Monetite + H+ ⇌ Ca+2 + H2PO4-

298.15 K, 1 bar log10K: 0.30 ΔH°r:-24098 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 0.65 0.30 -0.19 -0.75 -1.45 -2.19 -3.00 -4.00
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-870.694880 -0.145276 47592.521935 317.285887 -2704188.225241