Home Categories Inorganic chemistry Hydrobromic acid
A4737012

Hydrobromic acid , ACS,48% , 10035-10-6

Synonym(s):
HBr;Hydrobromic acid;Hydrogen bromide in acetic acid;Hydrogen Bromide Solution, Hydrobromic Acid

CAS NO.:10035-10-6

Empirical Formula: BrH

Molecular Weight: 80.91

MDL number: MFCD00011323

EINECS: 233-113-0

Update time: 2022-07-08

PRODUCT Properties

Melting point: −87 °C(lit.)
Boiling point: −67 °C(lit.)
Density  1.49 g/mL at 25 °C (lit.)
vapor density  2.8 (vs air)
vapor pressure  334.7 psi ( 21 °C)
refractive index  n20/D 1.438
Flash point: 40°C
storage temp.  Store below +30°C.
solubility  soluble
pka -9(at 25℃)
form  Solution
color  Light yellow, brown
Specific Gravity 1.49
Odor Sharp, irritating odor detectable at 2 ppm
PH 3.01(1 mM solution);2.04(10 mM solution);1.08(100 mM solution)
Water Solubility  soluble
Sensitive  Hygroscopic
Merck  14,4778
BRN  3587158
Exposure limits Ceiling limit 3 ppm (~10 mg/m3) (ACGIH); TLV-TWA 3 ppm (~10 mg/m3) (MSHA and OSHA).
Dielectric constant 7.0(-85℃)
Stability: Stable. Incompatible with strong bases, strong oxidizing agents, ammonia, ozone, fluorine, water, metals. Air and light sensitive.
LogP 0.629 at 25℃
CAS DataBase Reference 10035-10-6(CAS DataBase Reference)
NIST Chemistry Reference Hydrogen bromide(10035-10-6)
EPA Substance Registry System Hydrobromic acid (10035-10-6)

Description and Uses

Hydrobromic Acid is a strong acid formed by dissolving the diatomic molecule HBr in water. “Constant-boiling” hydrobromic acid is an aqueous solution that distills at 124.3°C and contains 47.6% HBr by weight. Hydrobromic acid has a pKa of 9, making it a stronger acid than hydrochloric acid, but not as strong as HI, hydroiodic acid. Hydrobromic acid is one of the strongest mineral acids known.
Hydrobromic acid is mainly used for the production of inorganic bromides, especially the bromides of zinc, calcium, and sodium. It is a useful reagent for generating organobromine compounds. Certain ethers are cleaved with HBr. It also catalyzes alkylation reactions and the extraction of certain ores. Industrially significant organic compounds prepared from hydrobromic acid include allyl bromide, tetrabromobis(phenol), and bromoacetic acid. Hydrobromic acid can be prepared in the laboratory via the reaction of Br2, SO2 and water. Another laboratory preparation involves the production of anhydrous HBr, which is then dissolved in water.
Hydrobromic acid has commonly been prepared industrially by reacting bromine with either sulfur or phosphorous and water. However, it can also be produced electrolytically. It can also be prepared by treating bromides with nonoxidizing acids like phosphoric or acetic acids. Hydrobromic acid is available commercially in various concentrations and purities.

Hydrobromic acid is used in the manufacture of bromide, as an alkylation catalyst, and in organic synthesis.

Safety

Symbol(GHS) 
GHS05,GHS07
Signal word  Danger
Hazard statements  H290-H314-H335
Precautionary statements  P280-P303+P361+P353-P305+P351+P338+P310
Hazard Codes  C,Xi
Risk Statements  35-37-34-10-36/37/38
Safety Statements  26-45-7/9-36/37/39
OEL Ceiling: 3 ppm (10 mg/m3)
RIDADR  UN 3265 8/PG 2
WGK Germany  1
RTECS  MW3850000
TSCA  Yes
DOT Classification 2.3, Hazard Zone C (Gas poisonous by inhalation)
HazardClass  8
PackingGroup  II
HS Code  28111990
Hazardous Substances Data 10035-10-6(Hazardous Substances Data)
Toxicity LC50 in mice, rats: 814, 2858 ppm by inhalation, K. C. Back et al., Reclassification of Materials Listed as Transportation Health Hazards (TSA-20-72-3, PB 214-270, 1972)
IDLA 30 ppm

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