Title: Mercurous Chloride
CAS Registry Number: 10112-91-1
Additional Names: Calomel; mild mercury chloride; mercury monochloride; mercury protochloride; mercury subchloride; precipité blanc
Trademarks: Calogreen (Mallinckrodt)
Molecular Formula: Cl2Hg2
Molecular Weight: 472.09
Percent Composition: Cl 15.02%, Hg 84.98%
Line Formula: Hg2Cl2
Properties: White, odorless, tasteless, heavy powder; slowly dec by sunlight into mercuric chloride and metallic mercury; sublimes at 400-500° without melting. d 7.15. Practically insol in water (0.00020 g/100 ml H2O at 25°). HCl or alkali and alkaline earth chlorides increase soly in water. Insol in alcohol, ether. Dec by solns of alkali iodides, bromides or cyanides into the mercuric salt and metallic mecury; solns of alkali chlorides act similarly but slowly. Blackened by ammonia, caustic alkali and alkaline earth solns. Protect from light.
Density: d 7.15
Use: Dark green Bengal lights; calomel paper, mixed with gold in painting on porcelain; for calomel electrodes; as fungicide; in agriculture to control root maggots on cabbage and onions.
Therap-Cat: Cathartic, diuretic, antiseptic, antisyphilitic.
Therap-Cat-Vet: Has been used as cathartic, and locally as an antiseptic and desiccant.
Keywords: Antiseptic/Disinfectant; Mercurial compounds; Diuretic; Organomercurials; Laxative/Cathartic.