Product Description of Hydroquinone CAS#123-31-9
Hydroquinone, also known as 1,4-benzenediol, has the molecular formula C₆H₆O₂ and a molecular weight of 110.11. It appears as colorless or white crystals and is prone to color changes when exposed to light and air. Its aqueous solutions can turn brown upon oxidation, with the process accelerating in alkaline conditions.
Hydroquinone has a melting point of 170–171°C, a boiling point of 285–287°C, a relative density of 1.33215, and exhibits a maximum UV absorption at 288 nm in water. It is readily soluble in hot water, ethanol, and ether, and slightly soluble in benzene.
This compound possesses active chemical properties and is easily oxidized. It can also participate in various reactions, including esterification and substitution.
![HydroquinoneCAS#123-31-9]( "HydroquinoneCAS#123-31-9")
Hydroquinone Chemical Properties
Melting point | 172-175 °C(lit.) |
Boiling point | 285 °C(lit.) |
density | 1.32 |
vapor density | 3.81 (vs air) |
vapor pressure | 1 mm Hg ( 132 °C) |
refractive index | 1.632 |
Fp | 165 °C |
storage temp. | Store below +30°C. |
solubility | H2O: 50 mg/mL, clear |
pka | 10.35(at 20℃) |
form | Needle-Like Crystals or Crystalline Powder |
color | White to off-white |
Odor | odorless |
Water Solubility | 70 g/L (20 ºC) |
Sensitive | Air & Light Sensitive |
Merck | 144808 |
BRN | 605970 |
Henry's Law Constant | (x 10-9 atm?m3/mol): <2.07 at 20 °C (approximate - calculated from water solubility and vapor pressure) |
Exposure limits | NIOSH REL: 15-min ceiling 2, IDLH 50; OSHA PEL: TWA 2; ACGIH TLV: TWA 2 (adopted). |
Stability: | Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, oxygen, ferric salts. Light and air-sensitive. Discolours in air. |
InChIKey | QIGBRXMKCJKVMJ-UHFFFAOYSA-N |
LogP | 0.59 at 20℃ |
CAS DataBase Reference | 123-31-9(CAS DataBase Reference) |
NIST Chemistry Reference | Hydroquinone(123-31-9) |
IARC | 3 (Vol. 15, Sup 7, 71) 1999 |
EPA Substance Registry System | Hydroquinone (123-31-9) |
Safety Information
Hazard Codes | Xn,N |
Risk Statements | 22-40-41-43-50-68-R68-R50-R43-R41-R40-R22 |
Safety Statements | 26-36/37/39-61-S61-S36/37/39-S26 |
RIDADR | 2662 |
WGK Germany | 3 |
RTECS | MX3500000 |
Autoignition Temperature | 930 °F |
TSCA | Yes |
HazardClass | 9 |
PackingGroup | III |
HS Code | 29072210 |
Hazardous Substances Data | 123-31-9(Hazardous Substances Data) |
Toxicity | LD50 orally in rats: 320 mg/kg (Woodard) |
IDLA | 50 mg/m3 |
![HydroquinoneCAS#123-31-9]( "HydroquinoneCAS#123-31-9")
Product Applications of Hydroquinone CAS#123-31-9
Hydroquinone is widely used in analytical chemistry and industrial applications. It can be applied in the colorimetric determination of phosphorus, magnesium, niobium, copper, silicon, and arsenic, as well as in the polarographic and volumetric determination of iridium.
It also functions as an effective reducing agent for heteropolyacids, copper, and gold, and is used in the testing of phosphate, tungstate, nitrate, nitrite, selenium, and tellurium. In addition, hydroquinone is commonly used as a developer, antioxidant, desulfurizer in the fertilizer industry, and as a urea synergist.
![HydroquinoneCAS#123-31-9]( "HydroquinoneCAS#123-31-9")
