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Potassium bromide CAS 7758-02-3

Potassium bromide (KBr) is an inorganic salt with the chemical formula KBr. It is white crystal or powder. It is easily soluble in water (the solubility is 102g/100ml at 100℃), slightly soluble in ethanol and ether. Its aqueous solution is neutral, with a density of 2.75g/cm³ (25℃), a melting point of 734℃, and a boiling point of 1435℃. ‌

Physical properties
Potassium bromide is a colorless cubic crystal, slightly hygroscopic, and easily turns yellow when exposed to light. It is soluble in water and glycerol, reacts with sulfuric acid to produce hydrogen bromide, and reacts with silver nitrate to produce silver bromide precipitate. ‌

Chemical properties
As a typical ionic compound, its aqueous solution is completely ionized, and the bromide ion can be replaced by fluorine and chlorine. It needs to be operated with caution when reacting with strong acids, strong oxidants, etc. ‌

Main uses
Analytical reagent: used for spot analysis to determine copper and silver, and polarographic analysis to detect indium, cadmium, arsenic and other elements. ‌

‌Photographic materials‌: manufacturing silver bromide dry plates (the core component of photographic film). ‌

‌Industrial applications‌: developer, removal of peripheral membrane proteins in molecular biology, etc.

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Model:
7758-02-3
Brand:
futurechemical
Code:
7758-02-3

Product Description

Potassium bromide Basic information
Product Name:	Potassium bromide
CAS:	2139626
MF:	BrK
MW:	119
EINECS:	231-830-3
Mol File:	7758-02-3.mol
Potassium bromide Chemical Properties
Melting point	734 °C (lit.)
Boiling point	1435 °C/1 atm (lit.)
bulk density	900-1000kg/m3
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.	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
λmax	λ: 280 nm Amax: 0.01
Sensitive	Hygroscopic
Merck	147,618
Dielectric constant	4.87
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)

检验项目Item	标准规定Prescription	检验结果Results
含量 % ≥ Assay min min	98.5-101.0	99.14
氯化物(以Cl计) % ≤ Chloride(as Cl) max	0.3	0.19
硫酸盐(以SO₄计) % ≤ Sulphates(as SO₄) max	0.005	0.002
溴酸盐(以BrO₃计) % ≤ Bromate(as BrO₃) max	0.003	0.003
碘化物(以I计) % Iodide(as I)	pass	pass
钡% ≤ Barium max	pass	pass
铁% ≤ Iron max	0.002	0.001
镁% ≤ Magnesiom max	0.01	0.008
重金属(以Pb计) % ≤ Heavy metal(as Pb) max	0.001	0.001
干燥失重% ≤ Loss of drying max	0.5	0.43