Ascorbic acid

  • Vitamin C
  • 3-Oxo-L-gulofuranolactone (enol form)
  • L-Xyloascorbic acid
  • L-Ascorbic acid
  • L-3-Ketothreohexuronic acid lactone
  • Vitascorbol
Formula
C6H8O6
Structure
Description
White crystals.
Uses
As antioxidant in foodstuffs, to prevent rancidity, to prevent browning of cut apples & other fruit.

Registry Numbers and Inventories.
CAS
50-81-7
EC (EINECS/ELINCS)
200-066-2
RTECS
CI7650000
RTECS class
Tumorigen; Drug; Mutagen; Reproductive Effector; Human Data
Merck
13,837
Beilstein/Gmelin
84272
Beilstein Reference
5-18-05-00026
Swiss Giftliste 1
G-7454
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H8O6
Formula mass
176.13
Melting point, °C
190 - 192
Boiling point, °C
553
Vapor pressure, mmHg
2E-14 (25 C)
Critical temperature
510
Critical pressure
52.2
Density
1.694 g/cm3 (20 C)
Solubility in water
330 g/L
pKa/pKb
4.13 (pKa)
Partition coefficient, pKow
-2.11
Heat of vaporization
148.7 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Do not expose to air. Store protected from light. Store under an inert atmosphere.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Store protected from light. Handle under an inert atmosphere. Store protected from air.
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 minimize contact with skin.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Carefully scoop up and place into appropriate disposal container. Provide ventilation. Place under an inert atmosphere.
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Oxidizing agents.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
276
Autoignition, °C
380
Upper exp. limit, %
14.5
Lower exp. limit, %
1.7
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. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
This material is probably combustible.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
-
Exposure effects
   Ingestion
Ingestion of large amounts may cause gastrointestinal irritation. Low hazard for usual industrial handling. Large doses may cause diarrhea and acidification of the urine which may cause stones in the urinary tract.
   Inhalation
May cause respiratory tract irritation. Low hazard for usual industrial handling.
   Skin
May cause skin irritation. Low hazard for usual industrial handling.
   Eyes
May cause eye irritation.

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

Transport.
4. Organic acids
HS Code
2936 27 00