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Physical Properties Uses Preparation Reactions
Chemical Name:
HgI2;MERCURIC IODIDE;VALSER'S REAGENT;mercurybiniodide;Mercury biniodide;redmercuriciodide;MERCURY(II) IODIDE;Red mercury iodide;MERCURIC IODIDE RED;mercuryiodide(hgi2)
Molecular Formula:
Formula Weight:
MOL File:


Melting point:
259 °C(lit.)
Boiling point:
354 °C(lit.)
Flash point:
350°C subl.
storage temp. 
Store at RT.
potassium iodide solution: passes test
6-7 (50g/l, H2O, 20℃)(slurry)
Water Solubility 
Insoluble inwater. Slightly soluble in alcohol, ether, acetone, chloroform, ethyl acetate, olive oil and castor oil.
Light Sensitive
Stable. Incompatible with strong oxidizing agents, potassium, sodium, interhalogens. Light-sensitive.
CAS DataBase Reference
7774-29-0(CAS DataBase Reference)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  T+,N
Risk Statements  26/27/28-33-50/53
Safety Statements  13-28-45-60-61
RIDADR  UN 2025 6.1/PG 2
WGK Germany  3
RTECS  OW5250000
HazardClass  6.1
PackingGroup  II
HS Code  28521000
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H300 Fatal if swallowed Acute toxicity,oral Category 1, 2 Danger P264, P270, P301+P310, P321, P330,P405, P501
H310 Fatal in contact with skin Acute toxicity,dermal Category 1, 2 Danger P262, P264, P270, P280, P302+P350,P310, P322, P361, P363, P405, P501
H330 Fatal if inhaled Acute toxicity,inhalation Category 1, 2 Danger P260, P271, P284, P304+P340, P310,P320, P403+P233, P405, P501
H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501
H400 Very toxic to aquatic life Hazardous to the aquatic environment, acute hazard Category 1 Warning P273, P391, P501
H410 Very toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 1 Warning P273, P391, P501
Precautionary statements:
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P262 Do not get in eyes, on skin, or on clothing.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P320 Specific treatment is urgent (see … on this label).
P330 Rinse mouth.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P405 Store locked up.

MERCURY(II) IODIDE price More Price(21)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 1.04420 Mercury(II) iodide red 7774-29-0 1EA $181 2017-11-08 Buy
Sigma-Aldrich 1.04420 Mercury(II) iodide red 7774-29-0 2EA $865 2017-11-08 Buy
Alfa Aesar 012289 Mercury(II) iodide, ACS, 99.0% min (Assay-dried basis) 7774-29-0 500g $366 2018-11-16 Buy
Alfa Aesar 012289 Mercury(II) iodide, ACS, 99.0% min (Assay-dried basis) 7774-29-0 100g $82.3 2018-11-16 Buy
Strem Chemicals 80-8008 Mercury(II) iodide, anhydrous (99.999%-Hg) PURATREM 7774-29-0 25g $304 2018-11-13 Buy

MERCURY(II) IODIDE Chemical Properties,Uses,Production

Physical Properties

Exists in two allotropic forms: red tetragonal allotropic modification (alpha form) and the yellow rhombic modification (beta form).
The red iodide has a density 6.36 g/cm3 at 25°C; transforms to yellow form at 127°C; also converts to yellow form at –180°C; slightly soluble in water (100 mg/L at 25°C); moderately soluble in acetone and alcohol.
The yellow iodide has a density of 6.09 g/cm3 at 27°C; melts at 259°C; vaporizes at 354°C; practically insoluble in water; low-to-moderately soluble in alcohol, benzene and other organic solvents.


Mercury(II) iodide is used as an analytical reagent, in Nesslers reagent for the analysis of ammonia. The compound also is used in ointments for the treatment of skin diseases.


Mercury(II) iodide is precipitated in its yellow form by adding a stoichiometric amount of potassium iodide to an aqueous solution of mercury(II) salt (e.g., HgCl2):
Hg2+ + 2I¯ → HgI2
The yellow precipitate rapidly turns red and dissolves in solution when excess potassium iodide is added.
Also, mercury (II) iodide is formed when mercury is rubbed with iodine moistened with ethanol.


Mercury(II) iodide reacts with excess iodide ion forming complex tetraiodomercurate(II) ion, [HgI4]:
HgI2 + 2I¯ → [HgI4]
In caustic soda or caustic potash solution, mercury(II) iodide forms complex salts, Na2HgI4 and K2HgI4, respectively. Alkaline solution of this complex in excess potassium hydroxide is known as Nessler’s reagent, used to analyze ammonia. The reaction of Nessler’s reagent with ammonia may be written as:
2[HgI4] + NH3 + 3OH¯ → I—Hg—O—Hg—NH3 +7I¯ + 2H2O
Similar complexes of silver, copper and other metals are known. Some of them change colors on heating and are used in heat-sensitive paints and applied to machine parts made out of brass or iron:
2Cu2+ + Hg2+ + 6I¯ → Cu2HgI4 + I2
2Ag+ + Hg2+ + 6I¯ → Ag2HgI4 + I2
             (yellow) In general, mercury(II) iodide forms neutral complexes of compositions M2(HgI4) and M(HgI3) with alkali and alkaline metal iodides.
When heated with dilute caustic potash solution, a yellow brown powder of composition HgI2•3HgO is obtained.

Chemical Properties

Red Solid


In animal chemistry for preparation of Nessler's Reagent (alkaline mercuric potassium iodide solution).

General Description

A scarlet-red odorless tasteless powder. Sensitive to light. Insoluble in water and sinks in water. At elevated temperatures turns yellow but turns back to red upon cooling. Poison.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

MERCURY(II) IODIDE is a mild reducing agent. Reacts with sodium azide to form mercury(II) azide, which is shock, friction, and heat sensitive. Incompatible with acetylene, ammonia, chlorine dioxide, azides, chlorine trifluoride, calcium (because of amalgam formation), sodium carbide, lithium, rubidium, copper .

Health Hazard

All forms of exposure to MERCURY(II) IODIDE are hazardous. Acute systemic mercurialism may be fatal within a few minutes; death by uremic poisoning is usually delayed 5-12 days. Acute poisoning has resulted from inhaling dust concentrations of 1.2-8.5 mg/m 3 of air; symptoms include tightness and pain in chest, coughing, and difficulty in breathing. Ingestion causes necrosis, pain, vomiting, and severe purging. Contact with eyes causes ulceration of conjunctiv a and cornea. Contact with skin causes irritation and possible dermatitis; systemic poisoning can occur by absorption through skin.

Fire Hazard

Special Hazards of Combustion Products: Fumes from fire may contain toxic mercury vapor.

Purification Methods

Crystallise it from MeOH or EtOH and wash it repeatedly with distilled water (solubility is 0.006% at ~25o). It has also been mixed thoroughly with excess 0.001M iodine solution, filtered, washed with cold distilled water, rinsed with EtOH and Et2O, and dried in air. It changes colour reversibly to yellow at ~130o. [Friend Nature 109 341 1922.] POISONOUS.

MERCURY(II) IODIDE Preparation Products And Raw materials

Raw materials

Preparation Products


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