Calomel

Formula : Hg2Cl2

Space group: 
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm
Dana class: 
9.1.8.1 (9) Anhydrous and Hydrated Halides (9.1) where A X (9.1.8) Dana Group
High temperature: 
Stable at room temperature
Geological context: 
Oxidized mercury deposits, supergene environment

Dernière mise à jour le 11.06.2018

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
cm3·mol-1
ΔGºf
J·mol-1
ΔHºf
J·mol-1
J·mol-1·k-1
CP
J·mol-1·K-1
472.085 32.940 -210725 -265370 191.600 101.97
Reaction properties

Calomel ⇌ 2Cl- + Hg2+2

298.15 K, 1 bar log10K: -17.84 ΔH°r: -8133 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K -19.48 -17.84 -16.12 -14.72 -13.56 -12.92 -12.74 -13.09