Hydroquinone CAS#123-31-9
Distinctive Physical Properties: Hydroquinone exists as colorless or white crystals with a melting point of 170-171°C and boiling point of 285-287°C, facilitating precise handling and storage in industrial applications.
Controlled Solubility: It is highly soluble in hot water, ethanol, and ether, while being slightly soluble in benzene, offering versatile options for solvent-based formulations and chemical processes.
Reactive Chemical Behavior: With active chemical properties, it readily undergoes oxidation, esterification, and substitution reactions, making it valuable for synthetic chemistry and organic transformations.
UV Absorbance Characteristics: Its aqueous solution exhibits a UV absorption maximum at 288 nm, which is beneficial for analytical and photochemical applications, such as in quality control or light-sensitive material testing.
Product Description of Hydroquinone (CAS# 123-31-9)
Hydroquinone, also known as 1,4-benzenediol, is a organic compound with the molecular formula C6H6O2 and a molecular weight of 110.11. It appears as colorless or white crystalline solid.
Exposure to light in air causes this substance to undergo color change. Its aqueous solution oxidizes to a brown hue in ambient air, with oxidation occurring more rapidly in alkaline environments. Key physical properties include a melting point range of 170-171°C, boiling point range of 285-287°C, relative density of 1.33215, and UV absorbance maximum at 288 nm in water.
Hydroquinone demonstrates excellent solubility in hot water, ethanol, and ether, while exhibiting slight solubility in benzene. It possesses highly reactive chemical characteristics, being readily oxidized and capable of participating in esterification and substitution reactions.
Parameters
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 | 1.6320 |
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 | 14,4808 |
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 |
Product Application of Hydroquinone (CAS# 123-31-9)
Hydroquinone serves as a versatile reagent in analytical chemistry and industrial processes. Its applications include:
· Colorimetric analysis: Used for the determination of phosphorus, magnesium, niobium, copper, silicon, and arsenic.
· Electrochemical methods: Acts as a reagent in polarographic and volumetric assays for iridium.
· Reduction reactions: Functions as a reducing agent for heteropolyacids, as well as for copper and gold.
· Test reagent: Employed in the detection of phosphate, tungstate, nitrate, nitrite, selenium, and tellurium.
· Photographic applications: Serves as a developer in imaging processes.
· Stabilization roles: Acts as an antioxidant in various formulations.
· Industrial treatment: Used as a desulfurizing agent in fertilizer production.
· Agricultural synergy: Serves as a synergist for urea in enhancing fertilizer efficacy.
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