Basic information Description Uses Spectrum purity Preparation Toxicity Safety Supplier Related
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Potassium bromide

Basic information Description Uses Spectrum purity Preparation Toxicity Safety Supplier Related

Potassium bromide Basic information

Product Name:
Potassium bromide
Synonyms:
  • bromuredepotassium
  • Hydrobromic acid potassium salt
  • KBr
  • Potassium bromide (KBr)
  • potassiumbromide(kbr)
  • Potassiumbromidecrystalopticdisc,13mmx2mm,polishedbothsides
  • Potassiumbromidecrystalopticrectangle,38.5mmx19.5mmx4mm,unpolished
  • Potassiumbromidecrystalopticrectangle,41mmx23mmx6mm,unpolished
CAS:
7758-02-3
MF:
BrK
MW:
119
EINECS:
231-830-3
Product Categories:
  • Chemical Synthesis
  • Crystal Grade Inorganics
  • Inorganic Salts
  • Materials Science
  • Metal and Ceramic Science
  • Potassium Salts
  • Biochemicals and Reagents
  • Density Gradient
  • Salts of Alkali Metals
  • Halogenated SolutionsVolumetric Solutions
  • N - RSynthetic Reagents
  • Salt Solutions
  • Volumetric Solutions
  • Synthetic Reagents
  • IR Spectroscopy Reagents
  • Metal and Ceramic Science
  • Analytical Reagents for General Use
  • O-P, Puriss p.a.
  • Puriss p.a.
  • ACS GradeSynthetic Reagents
  • Essential Chemicals
  • Potassium
  • Routine Reagents
  • O-P, Puriss p.a. ACSDerivatization Reagents
  • Derivatization Reagents TLC
  • Puriss p.a. ACS
  • TLC Reagents, N-R
  • TLC ReagentsDerivatization Reagents TLC
  • TLC Visualization Reagents (alphabetic sort)
  • O-P, Puriss p.a. ACS
  • Inorganics
  • PotassiumMetal and Ceramic Science
  • Crystal Grade Inorganics
  • Inorganic Salts
  • Potassium Salts
  • Salts
  • Synthetic Reagents
  • Reference Material Silver nitrateTitration
  • Salt Concentrates
  • By Reference Material
  • Concentrates (e.g. FIXANAL)
  • Halogenated ConcentratesConcentrates (e.g. FIXANAL)
  • Titration
  • IR Spectroscopy
  • Spectroscopy
  • AlphabeticalBiochemicals and Reagents
  • AlphabeticalSynthetic Reagents
  • PotassiumAnalytical Reagents
  • Puriss
  • metal halide
  • photographic emulsions and developers
Mol File:
7758-02-3.mol
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Potassium bromide Chemical Properties

Melting point:
734 °C (lit.)
Boiling point:
1435 °C/1 atm (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
Flash point:
1435°C
storage temp. 
Store at +5°C to +30°C.
solubility 
H2O: 1 M at 20 °C, clear, colorless
form 
random crystals
color 
White
Specific Gravity
2.75
PH
5.0-8.8 (25℃, 50mg/mL in H2O)
Water Solubility 
650 g/L (20 ºC)
λmax
λ: 260 nm Amax: 0.01
λ: 280 nm Amax: 0.01
Sensitive 
Hygroscopic
Merck 
14,7618
Stability:
Stable. Incompatible with strong oxidizing agents, strong acids, bromine trifluoride and bromine trichloride.
InChIKey
IOLCXVTUBQKXJR-UHFFFAOYSA-M
CAS DataBase Reference
7758-02-3(CAS DataBase Reference)
NIST Chemistry Reference
Potassium bromide(7758-02-3)
EPA Substance Registry System
Potassium bromide (7758-02-3)
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Safety Information

Hazard Codes 
Xi
Risk Statements 
36/37/38-36
Safety Statements 
26-45-61-7/9-39-36
RIDADR 
UN 1744 8/PG 1
WGK Germany 
2
RTECS 
TS7650000
3-10
TSCA 
Yes
HS Code 
28275100
Hazardous Substances Data
7758-02-3(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: > 2000 mg/kg

MSDS

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Potassium bromide Usage And Synthesis

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.

Chemical Properties

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.

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.

Uses

Potassium bromide (KBr) is used in photography and as a medical sedative.

Uses

manufacture of photographic papers and plates; process engraving.

Definition

ChEBI: A metal bromide salt with a K(+) counterion.

Definition

potassium bromide: A white orcolourless crystalline solid, KBr,slightly hygroscopic and soluble inwater and very slightly soluble inethanol; cubic; r.d. 2.75; m.p. 734°C;b.p. 1435°C. Potassium bromide maybe prepared by the action of bromineon hot potassium hydroxide solutionor by the action of iron(III) bromideor hydrogen bromide on potassiumcarbonate solution. It is used widelyin the photographic industry and isalso used as a sedative. Because of itsrange of transparency to infrared radiation,KBr is used both as a matrixfor solid samples and as a prism materialin infrared spectroscopy.

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).

Air & Water Reactions

Water soluble.

Reactivity Profile

Potassium bromide 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.

Hazard

Toxic by ingestion and inhalation

Fire Hazard

Flash point data for Potassium bromide are not available; however, Potassium bromide is probably nonflammable.

Biochem/physiol Actions

Potassium bromide (KBr) is used as an anticonvulsant and sedative. KBr is used for optical windows and prisms. KBr is transparent in the wide wavelength range from near ultraviolet to long wave infrared. It is employed in the sample preparation for infrared transmission spectra.

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.

Veterinary Drugs and Treatments

Bromides are used both as primary therapy and as adjunctive therapy to control seizures in dogs that are not adequately controlled by phenobarbital (or primidone) alone (when steady state trough phenobarbital levels are >30 mcg/mL for at least one month). While historically bromides were only recommended for use alone in patients suffering from phenobarbital (or primidone) hepatotoxicity, they are more frequently used as a drug of first choice.
Although not frequently used, bromides are also considered suitable by some for use in cats with chronic seizure disorders, but cats may be more susceptible to the drug’s adverse effects.

Purification Methods

Crystallise the bromide from distilled water (1mL/g) between 100o and 0o. Wash it with 95% EtOH, followed by Et2O. Dry it in air, then heat it at 115o for 1hour, pulverize it, then heat it in a vacuum oven at 130o for 4hours. It has also been crystallised from aqueous30% EtOH, or EtOH, and dried over P2O5 under vacuum before heating in an oven.

Potassium bromideSupplier

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Product Name:Potassium bromide
CAS:7758-02-3
Purity:0.999 Package:32RMB/kg
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Shanghai Aladdin Bio-Chem Technology Co.,LTD Gold
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Product Name:Potassium bromide
CAS:7758-02-3
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Product Name:POTASSIUM BROMIDE
CAS:7758-02-3
Purity:ACS Package:500G;25G;100G
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Product Name:Potassium Bromide
CAS:7758-02-3
Purity:99%