Pyrogallol is an organic compound with the formula C6H3(OH)3. It is a white water-soluble solid although samples are typically brownish because of its sensitivity toward oxygen. It is one of three isomeric benzenetriols. Melting point: 133-134 °C; boiling point 309 °C (at normal pressure), and 171.5 °C (at a pressure of 12 mm Hg). It is readily soluble in ether, ethanol, water (40g/100ml at 13 °C) and alkali solutions. Poorly soluble in benzene, chloroform and carbon tetrachloride.
- Formula
- C6H6O3
- Molar mass
- 126.111 g/mol
- CAS Number
- 87-66-1
- Density
- 1.450 g/cm3 at 20°C (68°F)
- Purity/Grade
- ≥99% (ACS Reagent)
- Appearence
- Beige crystaline
- Melting point/freezing point
- 131.0 - 135.0°C (267.8 - 275.0°F)
- Initial boiling point and boiling range
- 309°C (588°F) - lit.
- Vapour pressure
- 3 - 5 hPa (2 - 4 mmHg) at 140°C (284°F); 13 hPa (10 mmHg) at 167.7°C (333.9°F)
- Water solubility
- Soluble
- pH
- 5.8 at 10 g/l