Halite

Formula : NaCl

Family: 
Chlorides
Space group: 
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Dana class: 
9.1.1.1 (9) Anhydrous and Hydrated Halides (9.1) where A X(9.1.1) Dana Group
High temperature: 
Temperatures stability range from room temperature to ...
Geological context: 
A widespread salt, occurs comonly in sedimentary rocks, hydrothermal systems and magmatic rocks in fluid inclusions.

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
58.442 27.015 (Ref.: 78hel/del) Helgeson, H.C., Delany, J.M, Nesbitt, H.W., and Bird, D.K., 1978. Summary and Critique of the Thermodynamic Properties of Rock Forming Minerals: Amer. J. Sci., 278A, 229 pp. -384072 (Ref.: Internal calculation) -411120 (Ref.: 78hel/del, 98cha) 72.120 (Ref.: 98cha) Chase, M.W.J., 1998. NIST-JANAF Thermochemical Tables, Journal of Physical Chemistry Reference Data, Vol. 9, 4th Edition. National Institute of Standards and Technology, Washington DC, 1951 pp. 50.81 (Ref.: 78hel/del) Helgeson, H.C., Delany, J.M, Nesbitt, H.W., and Bird, D.K., 1978. Summary and Critique of the Thermodynamic Properties of Rock Forming Minerals: Amer. J. Sci., 278A, 229 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.
45.94 16.32 0.00 (Ref.: 78hel/del) Helgeson, H.C., Delany, J.M, Nesbitt, H.W., and Bird, D.K., 1978. Summary and Critique of the Thermodynamic Properties of Rock Forming Minerals: Amer. J. Sci., 278A, 229 pp.
Reaction properties

Halite ⇌ Cl- + Na+

298.15 K, 1 bar log10K: 1.59 ΔH°r:3700 J·mol-1 (Ref.: 78hel/del, 98cha)
T(°C) 0 25 60 100 150 200 250 300
log10K 1.50 1.59 1.63 1.59 1.45 1.24 0.92 0.43
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-752.246105 -0.119049 41385.514329 274.178074 -2480899.557426