CAS Number: 10035‑10‑6
Synonyms: Hydrobromic acid; HBr (48% w/w); Hydrogen bromide solution
Chemical Formula:HBr (aq)
Molecular Weight:80.91 g/mol
Product Introduction
A strong, colorless to slightly yellow aqueous acid (~48% w/w HBr), with acrid odor. Used as a brominating and dehydrating agent in organic synthesis, production of inorganic bromides, catalyst in esterifications, isomerization, ore extraction, and phenolic ether deprotection.
| Property | Value |
|---|---|
| Appearance | Colorless to faint yellow liquid |
| Assay | 47.5–49.5% HBr (48% w/w) |
| Density @ 25 °C | ~1.49 g/mL |
| Vapor Pressure @ 25 °C | ~8 mm Hg (≈10.6 hPa) |
| Vapor Density | ~2.8 × air |
| Refractive Index (n₂₀ᴅ) | ~1.438 |
| Boiling Point (azeotrope) | 124.3 °C (pure HBr): azeotropic 47.6% HBr |
| Solubility | Fully miscible with water |
| pKₐ | ~–9 |
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