Mercury(I) chloride

Mercury(I) chloride
Names
IUPAC name
Dimercury dichloride
Other names
Mercury(I) chloride
Mercurous chloride
Calomel
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.030.266 Edit this at Wikidata
EC Number
  • 233-307-5
25976
RTECS number
  • OV8750000
UNII
UN number 3077
  • InChI=1S/2ClH.2Hg/h2*1H;;/q;;2*+1/p-2 checkY
    Key: ZOMNIUBKTOKEHS-UHFFFAOYSA-L checkY
  • Cl[Hg][Hg]Cl
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
1.43×10−18[1]
Solubility insoluble in ethanol, ether
−26.0·10−6 cm3/mol
1.973
Structure
tetragonal
Thermochemistry
196 J·mol−1·K−1[2]
−265 kJ·mol−1[2]
Hazards
GHS labelling:
GHS07: Exclamation markGHS09: Environmental hazard
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)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
0
0
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
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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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]

  1. ^ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
  2. ^ a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.
  3. ^ "Mercury compounds [except (organo) alkyls] (as Hg)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  4. ^ Chisholm, Hugh, ed. (1911). "Calomel" . Encyclopædia Britannica (11th ed.). Cambridge University Press.
  5. ^ Housecroft, C. E.; Sharpe, A. G. (2004). Inorganic Chemistry (2nd ed.). Prentice Hall. pp. 696–697. ISBN 978-0-13-039913-7.
  6. ^ Skoog, Douglas A.; Holler, F. James; Nieman, Timothy A. (1998). Principles of Instrumental Analysis (5th ed.). Saunders College Pub. pp. 253–271. ISBN 978-0-03-002078-0.