| Identification | More | [Name]
MERCUROUS CHLORIDE | [CAS]
10112-91-1 | [Synonyms]
CALOMEL
MERCUROUS CHLORIDE
MERCURY(+1)CHLORIDE
MERCURY CHLORIDE
MERCURY(I) CHLORIDE
MERCURY(II) CHLORIDE
Calogreen
Calotab
Chlorure mercureux
chloruremercureux
Dimercury dichloride
dimercurydichloride
Hg2-Cl2
Hydrochloric acid mercury salt (1:1)
mercurous
Mercury chloride (Hg2Cl2)
Mercury monochloride
Mercury protochloride
Mercury subchloride
mercurychloride(hg2cl2) | [EINECS(EC#)]
233-307-5 | [Molecular Formula]
Cl2Hg2 | [MDL Number]
MFCD00011043 | [Molecular Weight]
472.09 | [MOL File]
10112-91-1.mol |
| Chemical Properties | Back Directory | [Appearance]
White, rhombic crystals or crystalline
powder; odorless. Stable in air but darkens on exposure to light.decomposed by alkalies. Insoluble in water, ether, alcohol,
and cold dilute acids. | [Melting point ]
400 °C (subl.)(lit.) | [Boiling point ]
383°C | [density ]
7.15 | [vapor pressure ]
1.7 mm Hg at 236 °C | [storage temp. ]
Poison room | [solubility ]
insoluble in ethanol, ethyl ether | [form ]
powder
| [color ]
White | [Specific Gravity]
7.15 | [Odor]
Odorless | [Water Solubility ]
Soluble in (0.002g/L )water. | [Sensitive ]
Moisture & Light Sensitive | [Merck ]
14,5894 | [Solubility Product Constant (Ksp)]
pKsp: 17.88（25°C） | [Dielectric constant]
7.0（Ambient） | [Exposure limits]
ACGIH: TWA 0.025 mg/m3 (Skin)
NIOSH: IDLH 10 mg/m3; TWA 0.05 mg/m3; Ceiling 0.1 mg/m3 | [InChIKey]
ZOMNIUBKTOKEHS-UHFFFAOYSA-L | [CAS DataBase Reference]
10112-91-1(CAS DataBase Reference) | [NIST Chemistry Reference]
Mercurous chloride(10112-91-1) | [EPA Substance Registry System]
10112-91-1(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
Xn,N | [Risk Statements ]
R22:Harmful if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin .
R50/53:Very Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment . | [Safety Statements ]
S13:Keep away from food, drink and animal feeding stuffs .
S24/25:Avoid contact with skin and eyes .
S46:If swallowed, seek medical advice immediately and show this container or label .
S60:This material and/or its container must be disposed of as hazardous waste .
S61:Avoid release to the environment. Refer to special instructions safety data sheet . | [RIDADR ]
UN 2811 6.1/PG 3
| [WGK Germany ]
3
| [RTECS ]
OV8740000
| [TSCA ]
Yes | [HazardClass ]
6.1 | [PackingGroup ]
II |
| Hazard Information | Back Directory | [General Description]
Odorless white solid. Sinks in water. | [Reactivity Profile]
MERCUROUS CHLORIDE is incompatible with acetylene, ammonia, chlorine dioxide, azides, calcium (amalgam formation), sodium carbide, lithium, rubidium, copper . | [Hazard]
Toxic dose is uncertain. | [Health Hazard]
Acute poisoning can result from inhaling dust concentrations of 1.2-8.5 mg/m 3 in air; symptoms include pain and tightness in chest, coughing, and difficulty in breathing. Compound is an irritant, cathartic, or purgat ive; rarely, ``calomel sickness,'' a benign reaction with fever and rash, appears after about 1 week; seldom causes systemic poisoning but may be fatal if retained to 30-40 mg/kg. Contact with eyes causes mild irritation. | [Description]
Mercury(I) chloride, a colorless solid also known as the mineral calomel, is the compound with the formula Hg2Cl2, with
the connectivity Cl-Hg-Hg-Cl. It reacts with chlorine to form mercuric chloride, which resists further oxidation. Hg2Cl2 is
a linear molecule. Mercurous chloride forms through the reaction of elemental mercury and mercuric chloride.
Hg + HgCl2→Hg2Cl2 | [Definition]
ChEBI: Dimercury dichloride is a mercury coordination entity. | [Production Methods]
Mercurous chloride
is produced by exposing mercury metal to limited
amounts of chlorine gas, insufficient to form mercuric chloride
as the major product; it can also be prepared by precipitation
from mercurous nitrate solution. | [Carcinogenicity]
An acute oral
dose in humans of 1 g HgCl2 may cause corrosive damage
to the GI tract; there is, however, little quantitative information
on dose–effect relationships during low-level
exposure to inorganic mercury. A dose of 2 g may be
expected to increase mortality greatly among victims of
the poison. Death from acute oral exposure is usually
caused by cardiovascular collapse and renal failure.
Ingestion of inorganic compounds may cause gastrointestinal
corrosion and irritation, such as vomiting, bloody diarrhea,
and stomach pains. | [Environmental Fate]
Calomel can generate reactive oxygen species and deplete
glutathione levels. Both genotoxic and nongenotoxic mechanisms
may contribute to renal carcinogenic effect of mercury. | [Toxicity evaluation]
Calomel decomposes gradually in the presence of sunlight.
It slowly decomposes to mercury and mercuric chloride under
aqueous conditions. |
| Questions And Answer | Back Directory | [Chemical Properties]
Mercury (I) chloride is a dense white powder and insoluble in water and may be light sensitive. It is incompatible with strong bases, carbonates, sulphides, cyanides, alkalis, sulphites, sulphates, hydrogen peroxide, ammonia, iodine, and hydrogen bromide.
| [Uses]
Mercury(I) chloride is used in calomel electrodes; in ceramic painting; as a fungicide; in pyrotechnics for producing dark green light; in agriculture for controlling root maggots; and as an antiseptic and antisyphilitic agent in medicine.
| [Preparation]
Mercury(I) chloride is prepared by passing a limited amount of chlorine gas over mercury in a heated silica retort. Excess chlorine should be avoided as it can oxidize mercury(I) chloride to mercury(II) chloride.
2Hg + Cl2 → Hg2Cl2
The product generally contains some mercury(II) chloride which is removed by treating the product mixture with water and filtering out the insoluble mercury(I) salt from the soluble mercury(II) salt.
The compound also can be made by heating mercury(II) chloride with mercury. The product Hg2Cl2 sublimes and is collected:
HgCl2 + Hg → Hg2Cl2
Mercury(I) chloride is obtained as a white precipitate by adding a cold acidic solution of sodium chloride or other soluble chloride to a solution of mercurous salt, such as mercury(I) nitrate:
[Hg2]2+ (aq) + 2Cl¯ (aq) → Hg2Cl2 (s)
The precipitation method, however, does not form high-purity product as it contains small amounts of reactant and product ions that stick to the Hg2Cl2 precipitate and are difficult to remove by washing with water.
| [Reactions]
Mercury(I) chloride oxidizes to mercury(II) chloride when heated with chlorine:
Hg2Cl2 + Cl2 → 2HgCl2
Mercury(I) chloride is a reducing agent and, therefore, its reaction with oxidizing substances can oxidize it to Hg(II) compounds.
When heated at elevated temperatures, it partially dissociates to mercury metal and mercury(II) chloride:
Hg2Cl2 → Hg + HgCl2
This disproportionation (or breakdown of a compound into two products containing the same element but in different oxidation states) also occurs to some degree when mercury(I) chloride is heated and sublimed in an open container. Reaction with ammonia in solution forms an unstable black adduct which slowly converts to mercury(II) amidochloride, NH2HgCl, releasing mercury:
Hg2Cl2 + 2NH3 → ClHg—HgNH2 + NH4Cl
ClHg—HgNH2 → NH2HgCl + Hg
| [Toxicity]
Mercury(I) chloride is highly toxic by ingestion and other routes of exposure. The symptoms include nausea, vomiting, abdominal pain, diarrhea and kidney damage.
|
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