1,2,4-Benzenetriol

  • 2,5-Dihydroxyphenol
  • Hydroxyhydroquinone
  • 4-Hydroxycatechol
  • 1,2,4-Trihydroxybenzene
  • 2-Hydroxy-1,4-hydroquinone
  • 2-Hydroxy-1,4-hydroquinone
Formula
C6H6O3
Structure
Description
Beige powder.
Uses
Substance is used in gas analysis.

Registry Numbers and Inventories.
CAS
533-73-3
EC (EINECS/ELINCS)
208-575-1
R 36/37/38
RTECS
DC4200000
RTECS class
Mutagen; Primary Irritant
Merck
13,1073
Beilstein/Gmelin
2042863
Beilstein Reference
4-06-00-07338
Swiss Giftliste 1
G-6001
Canada DSL/NDSL
NDSL
US TSCA
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H6O3
Formula mass
126.11
Melting point, °C
140
Boiling point, °C
362
Vapor pressure, mmHg
1E-5
Vapor density (air=1)
Negligible
Density
1.45 g/cm3
Solubility in water
Soluble
Refractive index
1.5445 (20 C)
pKa/pKb
9.58 (pKa)
Partition coefficient, pKow
0.06
Heat of vaporization
63.2 kJ/mol
Heat of combustion
-2655 kJ/mol

Hazards and Protection.
Storage
Keep containers tightly closed. Do not expose to air. Store protected from light. Store in a cool, dry area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Store protected from light. Store protected from air. Do not breathe dust.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves and clothing to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
Respirators
Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.
Small spills/leaks
Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures. May discolor on exposure to air. Light sensitive.
Incompatibilities
Oxidizing agents, bases, acid chlorides, acid anhydrides, air, direct light.
Decomposition
Carbon monoxide, carbon dioxide, acrid smoke and fumes.

Fire.
Flash Point,°C
193
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Health
2
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
3
Exposure effects
Effects may be delayed.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
Causes respiratory tract irritation. Can produce delayed pulmonary edema.
   Skin
Causes skin irritation. Substance is readily absorbed through the slkin.
   Eyes
Causes eye irritation. May cause chemical conjunctivitis.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.