Oxalic acid

  • Ethanedioic acid
Formula
(COOH)2
Structure
Description
Odorless white solid.
Uses
Scouring agent in textile finishing, stripping, cleaning, for bleach & stain remover, rust, grease, and wax removing agent in metal cleaning, chemical int.

Registry Numbers and Inventories.
CAS
144-62-7
EC (EINECS/ELINCS)
205-634-3
EC Index Number
607-006-00-8
EC Class
Harmful
RTECS
RO2450000
RTECS class
Reproductive Effector; Human Data; Primary Irritant
UN (DOT)
3261
Merck
12,7043
Beilstein/Gmelin
385686
Beilstein Reference
4-02-00-01819
EPA OPP
9601
Swiss Giftliste 1
G-2077
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C2H2O4
Formula mass
90.04
Melting point, °C
99 - 100
Boiling point, °C
365
Decomposition point, °C
188
Vapor pressure, mmHg
2.5E-5 (25 C)
Vapor density (air=1)
4.3
Odor Threshold Odor threshold Odorless
Density
1.948 g/cm3 (-143 C)
Solubility in water
140 g/L
pKa/pKb
1.46 (pKa)
Partition coefficient, pKow
-0.62
Heat of vaporization
67.2 kJ/mol
Heat of combustion
-245.6 kJ/mol

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Minimize dust generation and accumulation. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale. Discard contaminated shoes.
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 to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, bases, hypochlorite, sodium chloride, stong alkalies, chlorites.
Decomposition
Carbon monoxide, carbon dioxide, acrid smoke and fumes, formic acid.

Fire.
Flash Point,°C
189
Upper exp. limit, %
28
Lower exp. limit, %
8.5
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. Use water spray to keep fire-exposed containers cool. Substance is noncombustible. Contact with metals may evolve flammable hydrogen gas. Containers may explode if exposed to fire. Extinguishing media: Do NOT get water inside containers. For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use dry chemical, carbon dioxide, alcohol-resistant foam, or water spray. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Generates poisonous gases
Health
3
 
Flammability
1
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: ppm; 1 mg/m3; 2 mg/m3 (STEL) (ACGIH 1995-1996). OSHA PEL: TWA 1 mg/m3 NIOSH REL: TWA 1 mg/m3 ST 2 mg/m3 NIOSH IDLH: 500 mg/m3
Poison_Class
2
Exposure effects
Increased deep tendon reflexes, drowsiness, stupor, seizures and coma may be noted.
   Ingestion
Causes gastrointestinal tract burns. The toxicological properties of this substance have not been fully investigated. May cause nervous system
   Inhalation
Causes chemical burns to the respiratory tract. The toxicological properties of this substance have not been fully investigated.
   Skin
Causes skin burns.
   Eyes
Causes eye burns.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
3261
Response guide
Hazard class
8
Packing Group
I; II; III
 
USCG CHRIS Code
OXA