Pirssonite

Formula : Na2Ca(CO3)2:2H2O

Family: 
Carbonates
Space group: 
Orthorhombic - Pyramidal HM symbol (mm2) Space Group: F dd2
Dana class: 
15.2.1.1V - 15 Hydrated Carbonates ; 15.2 Hydrated Carbonates where A+m B++n (XO3)p . x(H2O), (m+n):p > 1:1 ; 15.2.1

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
242.106 102.600 (Ref.: 63wyc) Wyckoff, R.W.G., 1963, Crystal Structures, Second edition, tome 4, Interscience Publishers, New York, p. 320-322. -2657648 (Ref.: 99kon/kon) Konigsberger E., Konisberger L.C., and Gamsjager H., 1999. Low temperature thermodynamic model for the system Na2CO3 MgCO3 CaCO3 H2O. Geochimica et Cosmochimica Acta, 63, p. 3105-3119. -2955377 (Ref.: Internal calculation) 239.050 (Ref.: 99kon/kon) Konigsberger E., Konisberger L.C., and Gamsjager H., 1999. Low temperature thermodynamic model for the system Na2CO3 MgCO3 CaCO3 H2O. Geochimica et Cosmochimica Acta, 63, p. 3105-3119.
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

Pirssonite + 2H+ ⇌ 2HCO3- + Ca+2 + 2Na+ + 2H2O

298.15 K, 1 bar log10K: 11.75 ΔH°r:-19823 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 12.09 11.75 11.43 11.25 11.18 11.13 10.99 10.54
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1803.152985 -0.265024 98762.261849 656.117654 -5409570.452926