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Potassium bromide

Description Uses Spectrum purity Preparation Toxicity
Potassium bromide
Potassium bromide structure
Chemical Name:
Potassium bromide
Molecular Formula:
Formula Weight:
MOL File:

Potassium bromide Properties

Melting point:
734 °C(lit.)
Boiling point:
58.8 °C(lit.)
3.119 g/mL at 25 °C(lit.)
vapor density 
7.14 (vs air)
vapor pressure 
175 mm Hg ( 20 °C)
refractive index 
Flash point:
storage temp. 
H2O: 1 M at 20 °C, clear, colorless
random crystals
Specific Gravity
5.0-8.8 (25℃, 50mg/mL in H2O)
Water Solubility 
650 g/L (20 ºC)
λ: 260 nm Amax: 0.01
λ: 280 nm Amax: 0.01
Stable. Incompatible with strong oxidizing agents, strong acids, bromine trifluoride and bromine trichloride.
CAS DataBase Reference
7758-02-3(CAS DataBase Reference)
NIST Chemistry Reference
Potassium bromide(7758-02-3)
EPA Substance Registry System
Potassium bromide (KBr)(7758-02-3)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
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
HS Code  28275100
Hazardous Substances Data 7758-02-3(Hazardous Substances Data)
Toxicity LD50 orally in Rabbit: > 2000 mg/kg
Signal word: Warning
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H303 May be harmfulif swallowed Acute toxicity,oral Category 5 P312
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P337+P313 IF eye irritation persists: Get medical advice/attention.
P405 Store locked up.

Potassium bromide price More Price(75)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 221864 Potassium bromide FT-IR grade, ≥99% trace metals basis 7758-02-3 25g $119 2018-11-20 Buy
Sigma-Aldrich 221864 Potassium bromide FT-IR grade, ≥99% trace metals basis 7758-02-3 100g $338 2018-11-20 Buy
TCI Chemical P1747 Potassium Bromide >99.0%(T) 7758-02-3 300g $19 2018-11-22 Buy
Alfa Aesar 010837 Potassium bromide, Puratronic?, 99.999% (metals basis) 7758-02-3 10g $79.6 2018-11-16 Buy
Alfa Aesar 010837 Potassium bromide, Puratronic?, 99.999% (metals basis) 7758-02-3 50g $270 2018-11-16 Buy

Potassium bromide Chemical Properties,Uses,Production


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.


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.


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 ↑


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.


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.


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.


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


manufacture of photographic papers and plates; process engraving.

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.


Toxic by ingestion and inhalation

Fire Hazard

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

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.

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

Preparation Products

Potassium bromide Suppliers

Global( 292)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22043 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20786 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32651 55
Hangzhou FandaChem Co.,Ltd.
0086 158 5814 5714 (Mobile; WhatsApp; Telegram)
+86-571-56059825 CHINA 2455 55
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 24118 58
Hubei Jusheng Technology Co.,Ltd.
86-188-71490254 CHINA 20243 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 4525 58
Shanghai Zheyan Biotech Co., Ltd.
18017610038 CHINA 3624 58
Sinopharm Chemical Reagent Co,Ltd. 86-21-63210123
86-21-63290778 86-21-63218885 China 9966 79
Shanghai Aladdin Bio-Chem Technology Co.,LTD 021-20337333/400-620-6333
021-50323701 China 25106 65

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