Here are some things from the EPA:
Chemical Formula: HgCl2
Molecular Weight: 271.52
Routes of Entry: Inhalation: Yes (Weiss 1980, p. 581)
Skin: Yes (*Gosselin 1976)
Ingestion: Yes (*Browning 1969)
Health Hazards (Acute, Delayed, and Chronic): It is classified as
extremely toxic. All forms of mercury are poisonous if absorbed. Probable
oral lethal dose is 5-50 mg/kg; between 7 drops and 1 teaspoonful for a 150
lb. person. Mercuric chloride is one of the most toxic salts of mercury
(*Gosselin 1976). Material attacks the gastrointestinal tract and renal
systems (*Friberg 1979).
Extinguishing Methods: Some of these materials may burn but none of them
ignite readily. Extinguish with water spray, fog, foam, dry chemical or
carbon dioxide (*DOT 1984).
Unusual Fire and Explosion Hazards: Material may explode on heating, with
friction, or contact with alkali metals, sulfides, acetylene, ammonia, and
oxalic acid (*Rumack 1975 to Present).
Stability: Unstable:
Stable: Yes (Weiss 1980, p. 581)
Conditions to Avoid: Mercuric chloride may explode with friction or
application of heat. Mixtures of mercuric chloride and sodium or
potassium are shock sensitive and will explode on impact (*NFPA 1978).
Avoid contact with acids or acid fumes (*Sax 1975).
Incompatibility (Materials to Avoid): Formates, sulfites, hypophosphites,
phosphates, sulfides, albumin, gelatin, alkalies, alkaloid salts, ammonia,
lime water, antimony, arsenic, bromides, borax, carbonates, reduced iron,
copper, iron, lead, silver salts, infusions of cinchona, columbo, oak bark
or senna, and tannic acid (*Merck 1983).
Hazardous Decomposition or Byproducts: Upon decomposition highly toxic
chloride and mercury fumes are emitted (*Sax 1975).
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