Malonic acid

  • Carboxyacetic acid
  • Propanedioic acid
  • Dicarboxymethane
  • Methanedicarboxylic acid
Formula
C3H4O4
Structure
Description
White crystals or crystalline powder. Sublimes in vacuum.
Uses
Substance is used in production of barbiturates.

Registry Numbers and Inventories.
CAS
141-82-2
EC (EINECS/ELINCS)
205-503-0
EC Class
harmful, irritant
R 22 36/37
S 26 36/37/39
RTECS
OO0175000
RTECS class
Mutagen; Primary Irritant
Merck
13,5732
Beilstein/Gmelin
1751370
Beilstein Reference
4-02-00-01874
Swiss Giftliste 1
G-8517
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H4O4
Formula mass
104.06
Melting point, °C
136
Boiling point, °C
387
Vapor pressure, mmHg
5E-7 (25 C)
Vapor density (air=1)
3.6
Density
1.669 g/cm3
Solubility in water
Very soluble
pKa/pKb
2.92 (pKa)
Partition coefficient, pKow
-0.56
Heat of vaporization
69.8 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale.
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 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
Wear a self contained breathing apparatus and appropriate Personal protection. (See Exposure Controls, Personal Protection section). Sweep up, then place into a suitable container for disposal.
Disposal code
4
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Bases, oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
157
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. Extinguishing media: For small fires, use water spray, dry chemical, carbon dioxide or chemical foam.
Fire potential
This material is probably combustible.

Health.
Poison_Class
4
Exposure effects
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed.
   Inhalation
May cause severe irritation of the upper respiratory tract with pain, burns, and inflammation.
   Skin
May cause severe irritation and possible burns.
   Eyes
May cause severe eye irritation. May cause eye burns.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   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.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
4. Organic acids
HS Code
2917 19 10