Hydroquinone|123-31-9

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

Form

Needle-Like Crystals or Crystalline Powder

Pka

10.35(at 20℃)

Color

White to off-white

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).