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7758-02-3

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Identification

Name
Potassium bromide
CAS
7758-02-3
Synonyms
BROMIDE BROMATE
Bromidesalt of potassium
BROMINE
BROMINE CONCENTRATE
BROMINE LIQUID
BROMINE TS
BROMINE WATER
BROMINE WATER, SATURATED
KALII BROMIDUM
KOPPESCHARR'S SOLUTION
POTASSIUM BROMIDE
POTASSIUM BROMIDE, APHA FOR HG
POTASSIUM BROMIDE SALINE
bromuredepotassium
Hydrobromic acid potassium salt
KBr
Potassium bromide (KBr)
potassiumbromide(kbr)
potassiumbromide[k3br3]
Tripotassium tribromide
EINECS(EC#)
231-830-3
Molecular Formula
BrK
MDL Number
MFCD00010896
Molecular Weight
119
MOL File
7758-02-3.mol

Chemical Properties

Appearance
odourless white or colourless crystalline solid
Appearance
White, crystalline granules or pow- der; pungent, strong, bitter, saline taste; somewhat hygroscopic.Solu- ble in water and glycerol; slightly soluble in alcohol and ether.
mp 
734 °C(lit.)

bp 
58.8 °C(lit.)

density 
3.119 g/mL at 25 °C(lit.)

vapor density 
7.14 (vs air)

vapor pressure 
175 mm Hg ( 20 °C)

refractive index 
1.559
Fp 
1435°C
storage temp. 
2-8°C

solubility 
H2O: 1 M at 20 °C, clear, colorless

form 
random crystals

Stability:
Stable. Incompatible with strong oxidizing agents, strong acids, bromine trifluoride and bromine trichloride.
Water Solubility 
650 g/L (20 ºC)
Sensitive 
Hygroscopic
Merck 
14,7618
Uses
This white crystal was made by the action of bromine on hot potassium hydroxide solution. It is soluble in water but much less so in alcohol. Potassium bromide was used as a secondary halide in combination with an iodide in the paper negative processes, the albumen on glass process, and the wet collodion processes. When silver bromide gelatin emulsion was invented, potassium bromide was the primary halide. It was also used in combination with either bichloride of mercury, copper sulfate, or potassium ferricyanide in photographic bleaches and as a restrainer in alkaline developers used for gelatin plates and developing-out papers.
CAS DataBase Reference
7758-02-3(CAS DataBase Reference)
NIST Chemistry Reference
Potassium bromide(7758-02-3)
EPA Substance Registry System
7758-02-3(EPA Substance)

Safety Data

Hazard Codes 
Xi
Risk Statements 
R36/37/38:Irritating to eyes, respiratory system and skin .
R36:Irritating to the eyes.
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S61:Avoid release to the environment. Refer to special instructions safety data sheet .
S7/9:Keep container tightly closed and in a well-ventilated place .
S39:Wear eye/face protection .
S36:Wear suitable protective clothing .
RIDADR 
UN 1744 8/PG 1

WGK Germany 
2

RTECS 
TS7650000


3-10
HS Code 
28275100
Safety Profile
Moderately toxic by ingestion and intraperitoneal routes. Large doses can cause central nervous system depression. Prolonged inhalation may cause skin eruptions. Mutation data reported. Violent reaction with BrF3. When heated to decomposition it emits toxic fumes of K2O and Br-. See also BROMIDES.
Hazardous Substances Data
7758-02-3(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

General Description
Odorless colorless crystals or white crystalline powder or white granular solid with a pungent bitter saline taste. Aqueous solutions are neutral (pH about 7).
Reactivity Profile
POTASSIUM BROMIDE(7758-02-3) is not in generally strongly reactive. A weak reducing agent, incompatible with oxidizing agents. Also incompatible with salts of mercury and silver. Violent reactions occur with bromine trifluoride. May react with nitrous ether spirit, many alkaloidal salts and starch. May also react with acids . Reacts with concentrated sulfuric acid to generate fumes of hydrogen bromide.
Air & Water Reactions
Water soluble.
Hazard
Toxic by ingestion and inhalation
Fire Hazard
Flash point data for this chemical are not available; however, POTASSIUM BROMIDE is probably nonflammable.

Material Safety Data Sheet(MSDS)

Questions And Answer

Description
Potassium bromide can be used as analytical reagents and developers, but also for the pharmaceutical industry.
It can be used as the emulsion reagents for the filmstrip and photo film; used for formulating developer, used as a sedative in medical treatment.
In photographic materials, Potassium bromide is used in the manufacture of photographic film, developer, film thickener, toner and color photo bleach. In medication, it is used as nerve tranquilizers (tribromide). In addition, it is also used for chemical analysis reagents, the transmission of the spectra and infrared ray, for making special soap as well as being used in sculpture, lithography and so on.
It can be used for the preforming in the infrared test.
Uses
Industry
Application
Role/benefit
Photography
Preparation of developing agent
Restrainer/ improves differentiation between exposed and unexposed crystals of silver halide, and thus reduces fog
Print developing solution
Alkaline accelerator/increases the printing density of thin negatives
Optics
Infrared spectroscopy
Sample carrier/has no significant optical absorption lines in its high transmission region
Human medicine
Treatment of epileptic and seizure disorders
Effective component/anti-convulsant and sedative activity
Veterinary
Treatment of seizures in dogs, cats,etc.
Effective component/anti-convulsant and sedative activity
Chemical analysis
Titration determination of copper and silver
Titration agent
Polarographic analysis of indium, cadmium and arsenic
Analytical agent
Removal of peripheral membrane proteins
 

Spectrum purity
For IR detection; used for infrared sample preparation;
Solubility (g/100ml)
0 ° C to 53.6 g; 10 ° C to 59.5 g; 20 ° C to 65.3 g; 30 ° C to 70.7 g; 40 ° C to 75.4 g
60 ° C to 85.5 g; 80 ° C to 94.9 g; 90 ° C to 99.2 g; 100 ° C to 104 g.
Preparation
The bromide is first reacted with scrap iron to obtain the Fe3Br8 • 16H2O, followed by reaction with the boiling potassium carbonate solution. Fe3Br8 • 16H2O + K2CO3-boiling heat-> 8KBr + Fe3O4 + 4CO2 + 16H2O, the Fe3O4 is filtered, followed by concentration to obtain potassium bromide.
Urea reduction method: send the caustic potassium solution dissolved with urea caustic potassium solution sent to the reactor. Slowly add bromine at 80 ° C for reaction. The reaction is completed when the Ph value is 6-7. The reaction solution is added to the storage tank, subjecting to activated carbon decolorization. When the solution becomes clean, apply filtering, evaporation, crystallization, centrifugal separation and drying, that is the finished product of potassium bromide. Its reaction equation is:
3Br2 + 6KOH + CO (NH2) 2 → 6KBr + 5H2O + CO2 ↑ + N2 ↑
Toxicity
Avoid ingestion or inhalation; avoid eye and skin contact. Upon ingestion, head dizziness, nausea may occur. Immediately seek medical treatment; Upon inhalation, vomiting will happen, the patient should be immediately moved to place with fresh air and sent for medical treatment; if splashed into eyes, immediately rinse with a lot of fresh water for 2 0min; skin, upon being contact with potassium bromide, should also be subject to rinsing with plenty of water.

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