MERCURIC BROMIDE Property

Melting point:

236 °C(lit.)

Boiling point:

322 °C(lit.)

Density 

6.1

vapor pressure 

1 mm Hg ( 136.5 °C)

Flash point:

322-325°C subl.

storage temp. 

Poison room

solubility 

Soluble in hot alcohol, methanol, HCl, HBr

form 

beads

color 

White

Specific Gravity

6.109

Water Solubility 

g/100g solution H2O: 0.3 (0°C), 0.611±0.002 (25°C), 4.7 (100°C) [KRU93]; very soluble hot alcohol, methanol, HCl, HBr; slightly soluble chloroform [MER06]

Sensitive 

Light Sensitive

Merck 

14,5875

Solubility Product Constant (Ksp)

pKsp: 19.21

Stability:

Stable, but may be light sensitive. Incompatible with potassium and sodium.

CAS DataBase Reference

7789-47-1(CAS DataBase Reference)

EPA Substance Registry System

Mercury bromide (HgBr2) (7789-47-1)

Safety

Hazard Codes 

T+,N

Risk Statements 

26/27/28-33-50/53

Safety Statements 

13-28-45-60-61

RIDADR 

UN 1634 6.1/PG 2

WGK Germany 

3

RTECS 

OV7415000

F 

8

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

II

HS Code 

28521000

Hazardous Substances Data

7789-47-1(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H373May cause damage to organs through prolonged or repeated exposure

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P262Do not get in eyes, on skin, or on clothing.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

MERCURIC BROMIDE Chemical Properties,Usage,Production

Description

Mercuric Bromide is a crystalline solid. Molecular weight= 360.41;Boiling point=322℃; Freezing/Melting point=236℃. Hazard Identification (based on NFPA-704 M Rating System): Health 3, Flammability 0, Reactivity 0. Slightly soluble in water.

Chemical Properties

white crystalline powder

Chemical Properties

Mercuric Bromide is a crystalline solid

Uses

Medicine.

Uses

Mercury(II) bromide is used as a reagent in the Koenigs-Knorr reaction, which forms glycoside linkages on carbohydrates. It is also used to test for the presence of arsenic, as recommended by the Pharmacopoeia.

Definition

ChEBI: Mercury dibromide is a mercury coordination entity composed of mercury and bromine with the formula HgBr2.

General Description

White rhombic crystals. Sensitive to light. Slightly soluble in water and denser than water. Severely toxic by inhalation and ingestion.

Air & Water Reactions

Slightly soluble in water.

Reactivity Profile

MERCURIC BROMIDE is incompatible with acetylene, ammonia, chlorine dioxide, azides, calcium (amalgam formation), sodium carbide, lithium, rubidium, copper . Reacts with sodium azide to give mercury(II) azide, which is sensitive to shock, friction, and heat. Mixing with hydrazine salts in basic solution produced a heat or shock sensitive yellow precipitate [Annalen, 1899, 305, 191]. Reacts violently with chlorine trifluoride *with ignition often occurring.

Hazard

Toxic by inhalation, ingestion, and skin absorption; strong irritant.

Health Hazard

TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. 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. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.

Safety Profile

A poison by ingestion, skin contact, and intraperitoneal routes. Vigorous reaction with indium at 35OC. Incompatible with sodmm and potassium. When heated to decomposition it emits very toxic fumes of Brand Hg. See also MERCURY COMPOUNDS and BROMIDES.

Synthesis

Five parts of Hg are covered with 60 parts of H2O and allowed to react at 50 °C (vigorous stirring) with four parts of Br2 , which is added dropwise as long as no permanent color is formed. The solution is then brought to a boil, filtered hot, and placed in an ice bath to induce crystallization. The salt is dried at as low a temperature as possible. Purification is by careful double or triple sublimation from a porcelain dish heated on a sand bath and covered with a Petri dish. When very high purity is required (e.g., for conductivity measurements), it may be necessary to re - peat the sublimation several times more.
Hg + Br2 = HgBr2

Potential Exposure

This compound has applications in medicine.

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical Mercuric bromide 1683 facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. Medical observation is recommended for 2448 h after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a corticosteroid spray. Antidotes and special procedures for medical personnel: The drug NAP (n-acetyl penicillamine) has been used to treat mercury poisoning, with mixed success. Note to physician: For severe poisoning BAL [British AntiLewisite, dimercaprol, dithiopropanol (C3H8OS2)] has been used to treat toxic symptoms of certain heavy metals poisoning including mercury. Although BAL is reported to have a large margin of safety, caution must be exercised, because toxic effects may be caused by excessive dosage. Most can be prevented by premedication with 1-ephedrine sulfate (CAS: 134-72-5).

storage

Color Code—Blue: Health Hazard/Poison: Store in a secure poison location. Prior to working with this chemical you should be trained on its proper handling and 1684 Mercuric bromide storage. Store in tightly closed containers in a cool, wellventilated area away from light, heat, and acids. Mercuric bromide must be stored to avoid contact with sodium and potassium, since violent reactions occur.

Shipping

UN1634 Mercuric bromides, Hazard Class: 6.1; Labels: 6.1-Poisonous materials

Purification Methods

Crystallise it from hot saturated ethanolic solution, dry and keep it at 100o for several hours under a vacuum, then sublime it. [Garrett J Am Chem Soc 61 2744 1939.] Its solubility in H2O is 0.6% at 20o, and 22% at 100o; in EtOH it is 30% at 25o; and in MeOH it is 69.6% at 25o. [Wagenknecht & Juza Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1109 1965.] POISONOUS.

Incompatibilities

Violent reaction with active metals; potassium, sodium. Store away from heat and light