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HomeProduct name listMercury iodide

Mercury iodide

  • CAS NO.:15385-57-6
  • Empirical Formula: Hg2I2
  • Molecular Weight: 654.98
  • MDL number: MFCD00016137
  • EINECS: 239-409-6
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2023-10-17 17:11:58
Mercury iodide Structural

What is Mercury iodide?

Chemical properties

bright yellow, amorphous, odorless, tasteless powder(s); darkens or becomes greenish in light forming HgI and liquid Hg; color changes to dark yellow, orange, and orange-red when heated, reverse order when cooled; enthalpy of fusion 27.00 kJ/mol; can be made by precipitation in HgNO3 solution with KI; used as a topical antibacterial agent in medicine [HAW93] [MER06] [KIR81] [CRC10]

General Description

Bright yellow powder. Becomes greenish on exposure to light due to disproportionation into metallic mercury and mercuric iodide. Insoluble in water but soluble in castor oil and aqueous ammonia. Becomes dark yellow, orange and red on heating but yellow again upon cooling. Density approx. 7.7 g / cm3. Toxic by inhalation and by ingestion.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

MERCUROUS IODIDE is incompatible with acetylene, ammonia, chlorine dioxide, azides, calcium (amalgam formation), sodium carbide, lithium, rubidium, copper .

Health Hazard

Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Containers may explode when heated. Runoff may pollute waterways.

Properties of Mercury iodide

Melting point: 290° when rapidly heated with partial decompn into Hg and HgI2
Boiling point: sublimes at 140℃ [HAW93]
Density  7.7 g/mL at 25 °C(lit.)
solubility  insoluble in H2O, ethanol, ethyl ether
form  yellow amorphous powder
color  yellow
Water Solubility  g/L solution H2O: 2.0×10?7 (25°C) [KRU93]; insoluble alcohol, ether [MER06]; soluble castor oil, ammonia [HAW93]
Solubility Product Constant (Ksp) pKsp: 28.72
CAS DataBase Reference 15385-57-6(CAS DataBase Reference)
NIST Chemistry Reference Mercury iodide(15385-57-6)
EPA Substance Registry System Mercury iodide (Hg2I2) (15385-57-6)

Safety information for Mercury iodide

Computed Descriptors for Mercury iodide

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