ChemicalBook > CAS DataBase List > Potassium bromide

Potassium bromide

Product Name
Potassium bromide
CAS No.
7758-02-3
Chemical Name
Potassium bromide
Synonyms
KBr;BROMINE WATER;BROMINE TS;Kaliumbromid;Battery Grade;BROMINE LIQUID;Potassium bromide (KBr);ACS， 99% min;KALII BROMIDUM;BROMIDE BROMATE
CBNumber
CB2854302
Molecular Formula
BrK
Formula Weight
119
MOL File
7758-02-3.mol
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Potassium bromide Property

Melting point:
734 °C (lit.)
Boiling point:
1435 °C/1 atm (lit.)
Density 
3.119 g/mL at 25 °C(lit.)
bulk density
900-1000kg/m3
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)
Sensitive 
Hygroscopic
λmax
λ: 260 nm Amax: 0.01
λ: 280 nm Amax: 0.01
Merck 
14,7618
Dielectric constant
4.8700000000000001
Stability:
Stable. Incompatible with strong oxidizing agents, strong acids, bromine trifluoride and bromine trichloride.
InChIKey
IOLCXVTUBQKXJR-UHFFFAOYSA-M
LogP
1 at 25℃
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

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
F 
3-10
TSCA 
Yes
HS Code 
28275100
Hazardous Substances Data
7758-02-3(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: > 2000 mg/kg
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Warning
Hazard statements

H319Causes serious eye irritation

Precautionary statements

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

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P337+P313IF eye irritation persists: Get medical advice/attention.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
P9881
Product name
Potassium bromide
Purity
ReagentPlus?, ≥99.0%
Packaging
500G
Price
$97.1
Updated
2025/07/31
Sigma-Aldrich
Product number
221864
Product name
Potassium bromide
Purity
FT-IR grade, ≥99% trace metals basis
Packaging
25g
Price
$178
Updated
2025/07/31
Sigma-Aldrich
Product number
221864
Product name
Potassium bromide
Purity
FT-IR grade, ≥99% trace metals basis
Packaging
100g
Price
$418
Updated
2025/07/31
Sigma-Aldrich
Product number
1.04907
Product name
Potassium bromide
Purity
for IR spectroscopy Uvasol?
Packaging
100g
Price
$485
Updated
2025/07/31
Sigma-Aldrich
Product number
1.04907
Product name
Potassium bromide
Purity
for IR spectroscopy Uvasol?
Packaging
500g
Price
$1040
Updated
2025/07/31
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Potassium bromide Chemical Properties,Usage,Production

Chemical Properties

Potassium bromide is a white or colourless crystalline solid with a pungent strong bitter and saline taste, slightly hygroscopic and soluble in water and very slightly soluble in ethanol and ether; cubic; r.d. 2.75; m.p. 734°C; b.p. 1435°C. Potassium bromide maybe prepared by the action of bromine on hot potassium hydroxide solutionor by the action of iron(III) bromideor hydrogen bromide on potassium carbonate solution. It is used widely in the photographic industry and is also used as a sedative. Because of itsrange of transparency to infrared radiation,KBr is used both as a matrix for solid samples and as a prism materialin infrared spectroscopy.

Uses

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.

Application

Potassium bromide is widely used in optics because KBr has a low refractive index and a wide spectral range into the infrared with nearly no absorption. As a result, KBr is widely used as infrared optical windows, as infrared beamsplitters, and as substrates for interferometers. Commonly KBr is used in transmission infrared spectroscopy as a media for powder samples. The KBr and powder are ground together and pressed, using a die, into a thin disc under vacuum. The disc suspends the sample without contributing to the transmitted signal. Potassium bromide has also been used in synthesis, commonly as a source of bromide ions. For example, double displacement of KBr and bismuth nitrate yielded nanosheets of bismuth oxybromide. Solutions of KBr have also been found to be useful shape-control agents or crystal-habit modifiers in formation of metal nanocrystals, including palladium nanorods and bimetallic platinum-paladium nanocrystals. KBr is a common source of bromide ions used as nucleophiles in organic chemistry.

Preparation

Potassium bromide was produced by the action of bromine on hot potassium hydroxide solution or Reacting elemental bromine with potassium hydroxide or potassium iodide will produce the potassium bromide salt:
KOH + Br2 → KBr + HOBr
KI + Br2 → KBr + I2
The reaction of bromine with potassium carbonate and urea is the basis of the process. The first step of the process involves the addition of K2SO4 to the potassium carbonate solution, followed by heating to 80 °C. After the lead-containing precipitate is removed by filtration, the bromine and urea are added, and the temperature and pH are adjusted to 30 °C and 6.0-6.5, respectively. Potassium bromide is recovered by recrystallization after reduction of volume of the reacting solution by evaporation. The sulfate can be removed from the solution by addition of BaBr2.

Definition

ChEBI: Potassium bromide is a metal bromide salt with a K(+) counterion. It is used in the manufacture of photographic film, developer, film thickener, toner and color photo bleach.

General Description

Potassium bromide is a white salt that crystallizes in the cubic rock salt structure, like sodium chloride. KBr is hygroscopic, deliquescent, highly soluble in water, and soluble in some polar organic solvents like glycerol, ethylene glycol, liquid ammonia, and hot ethanol, but insoluble in acetone. Aqueous solutions are neutral (pH about 7). When dissolved, KBr dissociates completely into its ions, making it a useful source of bromine ions in double displacement reactions or salt metathesis reactions. For example, this property was used in the production photographic films of silver bromide: KBr was reacted with silver nitrate to precipitate silver bromide, a salt that decomposes on exposure to light.

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.

Flammability and Explosibility

Non flammable

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 bromide Preparation Products And Raw materials

Raw materials

Ampicillin Potassium hydroxide Potassium carbonate 2,3-DICHLORO-5,8-DIHYDROXY-1,4-NAPHTHOQUINONE Urea Hydrogen bromide Bromine

Preparation Products

5-Bromo-2-oxindole 4-(Bromomethyl)tetrahydropyran Hydroxyacetone 1 10-PHENANTHROLINE-5 6-DIONE 97 MORPHOLINE-3,4-DICARBOXYLIC ACID 4-TERT-BUTYL ESTER Cyclopropanecarboxaldehyde DL-Threonine Potassium bromate 3-Bromo-7-(trifluoromethyl)imidazo[1,2-a]pyrimidine Beclobrate Cuprous bromide 1,1-diethoxyethylene Tazobactam acid MERCURIC BROMIDE 3-Bromobenzophenone mercurous bromide 4-Bromobenzyl bromide (S)-4-BOC-MORPHOLINE-3-CARBOXYLIC ACID trans,trans-Muconic acid 4-Phenoxy-2,6-Diisopropyl Aniline
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View Lastest Price from Potassium bromide manufacturers

Hebei Chuanghai Biotechnology Co., Ltd
Product
Potassium bromide 7758-02-3
Price
US $1.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
10 mt
Release date
2024-10-24
HebeiShuoshengImportandExportco.,Ltd
Product
Potassium bromide 7758-02-3
Price
US $6.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
2000KG/Month
Release date
2024-08-05
Hebei Chuanghai Biotechnology Co., Ltd
Product
Potassium bromide 7758-02-3
Price
US $0.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
500000kg
Release date
2024-11-01

7758-02-3, Potassium bromideRelated Search:

Potassium sorbate Potassium persulfate Potassium Acetate Losartan potassium Potassium sulfate Sodium bromide Lithium bromide Lithium Bromide hydrate IRON (III) BROMIDE LEAD(II) BROMIDE Aluminum Bromide Potassium chloride GERANYL BROMIDE INDIUM(III) BROMIDE Copper(I) bromide-dimethyl sulfide Hydrogen bromide Cuprous bromide Ethidium bromide

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