Mercury(I) chloride
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Mercury(I) chloride is the chemical compound with the formula Hg2Cl2. Also known as the mineral calomel[4] (a rare mineral) or mercurous chloride, this dense white or yellowish-white, odorless solid is the principal example of a mercury(I) compound. It is a component of reference electrodes in electrochemistry.[5][6]
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Dimercury dichloride | |
Other names | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.030.266 |
EC Number |
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25976 | |
PubChem CID |
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RTECS number |
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UNII | |
UN number | 3077 |
CompTox Dashboard (EPA) |
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Properties | |
Hg2Cl2 | |
Molar mass | 472.09 g/mol |
Appearance | White solid |
Density | 7.150 g/cm3 |
Melting point | 383 °C (721 °F; 656 K) (sublimes) |
0.2 mg/100 mL | |
Solubility product (Ksp) |
1.43×10−18[1] |
Solubility | insoluble in ethanol, ether |
−26.0·10−6 cm3/mol | |
Refractive index (nD) |
1.973 |
Structure | |
tetragonal | |
Thermochemistry | |
Std molar entropy (S⦵298) |
196 J·mol−1·K−1[2] |
Std enthalpy of formation (ΔfH⦵298) |
−265 kJ·mol−1[2] |
Hazards | |
GHS labelling: | |
Warning | |
H302, H315, H319, H335, H410 | |
P261, P264, P270, P271, P273, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P312, P321, P330, P332+P313, P337+P313, P362, P391, P403+P233, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
210 mg/kg (rat, oral)[3] |
Safety data sheet (SDS) | ICSC 0984 |
Related compounds | |
Other anions |
Mercury(I) fluoride Mercury(I) bromide Mercury(I) iodide |
Related compounds |
Mercury(II) chloride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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