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Mercury iodide

Mercury iodide
Mercury iodide structure
Chemical Name:
Mercury iodide
Hg2-I2;iodomercury;Mercuric iodid;Mercury iodide;mercurydiiodide;MERCUROUS IODIDE;dimercury diiodide;mercuryprotoiodide;MERCURY (I) IODIDE;Mercury protoiodide
Molecular Formula:
Formula Weight:
MOL File:

Mercury iodide Properties

Melting point:
290° when rapidly heated with partial decompn into Hg and HgI2
Boiling point:
sublimes at 140℃ [HAW93]
7.7 g/mL at 25 °C(lit.)
yellow amorphous powder
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)
  • Risk and Safety Statements
Hazard Codes  T+,N
Risk Statements  26/27/28-33-50/53
Safety Statements  13-28-45-60-61
RIDADR  UN 1638 6.1/PG 2
WGK Germany  3
HazardClass  6.1(b)
PackingGroup  III
HS Code  28521000

Mercury iodide Chemical Properties,Uses,Production

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.

Mercury iodide Preparation Products And Raw materials

Raw materials

Preparation Products

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