| Identification | More | [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 | Back Directory | [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.
| [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 | [Fp ]
1435°C | [storage temp. ]
2-8°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) | [Stability:]
Stable. Incompatible with strong oxidizing agents, strong acids, bromine trifluoride and bromine trichloride. | [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 | [InChIKey]
IOLCXVTUBQKXJR-UHFFFAOYSA-M | [LogP]
1 at 25℃ | [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 | Back Directory | [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
| [F ]
3-10 | [TSCA ]
Yes | [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) | [Toxicity]
LD50 orally in Rabbit: > 2000 mg/kg |
| Hazard Information | Back Directory | [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. | [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.
| [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. | [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. | [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. | [Flammability and Explosibility]
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. | [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. |
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