2-Oxopentanoic acid

  • a-Ketovaleric acid
  • 2-Oxovaleric acid
  • .alpha.-keto-Valeric acid;
  • .alpha.-Oxo-n-valeric acid
Formula
C5H8O3
Structure
Description
Clear, faintly yellow-green liquid.

Registry Numbers and Inventories.
CAS
1821-02-9
EC (EINECS/ELINCS)
217-340-2
36/37/38
Beilstein/Gmelin
635884
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C5H8O3
Formula mass
116.12
Melting point, °C
6.5
Boiling point, °C
179
Vapor pressure, mmHg
0.44 (25 C)
Critical temperature
422
Critical pressure
41.3
Density
1.110 g/mL (20 C)
Solubility in water
253 g/L (25 C)
pKa/pKb
2.65 (pKa)
Partition coefficient, pKow
-0.18
Heat of vaporization
45.82 kJ/mol

Hazards and Protection.
Storage
Store at 2 - 8 C. Keep container tightly closed.
Protection
Compatible chemical-resistant gloves. Chemical safety goggles. Protective clothing.
Respirators
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU). Where risk assessment shows air-purifying respirators are appropriate use a full-face respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls. If the respirator is the sole means of protection, use a full-face supplied air respirator.
Small spills/leaks
Absorb on sand or vermiculite and place in closed containers for disposal. Ventilate area and wash spill site after material pickup is complete.
Stability
Stable if stored as recommended.
Incompatibilities
Strong oxidizing agents.

Fire.
Flash Point,°C
77
Fire fighting
Extinguish with water spray, carbon dioxide, dry chemical powder or appropriate foam. Wear self-contained breathing apparatus and protective clothing to prevent contact with skin and eyes.
Hazards
Emits toxic fumes under fire conditions.
Health
1
 
Flammability
1
 
 
Reactivity
0
 

Health.
Exposure effects
   Ingestion
May be harmful if swallowed.
   Inhalation
May be harmful if inhaled. Material is irritating to mucous membranes and upper respiratory tract.
   Skin
Causes skin irritation. May be harmful if absorbed through the skin.
   Eyes
Causes irritation.

First aid
 
   Ingestion
If swallowed, wash out mouth with water provided person is conscious. Call a physician.
   Inhalation
If inhaled, remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen.
   Skin
In case of contact, immediately wash skin with soap and copious amounts of water. Remove contaminated clothing and shoes. Call a physician.
   Eyes
In case of contact with eyes, flush with copious amounts of water for at least 15 minutes. Assure adequate flushing by separating the eyelids with fingers. Call a physician.

Transport.