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Name Citric acid
CAS 77-92-9
EINECS(EC#) 201-069-1
Molecular Formula C6H8O7
MDL Number MFCD00163176
Molecular Weight 192.12
MOL File 77-92-9.mol

Chemical Properties

Appearance White crystalline powder
Melting point  153-159 °C (lit.)
Boiling point  248.08°C (rough estimate)
density  1.542
vapor density  7.26 (vs air)
vapor pressure  <0.1 hPa (20 °C)
FEMA  2306
refractive index  1.493~1.509
Fp  100 °C
storage temp.  Store at RT.
solubility  H2O: 1 M at 20 °C, clear, colorless
form  grit
pka 3.14(at 20℃)
color  White
Odor Odorless
PH 1.0-2.0 (25℃, 1M in H2O)
Stability: Stable. Incompatible with bases, strong oxidizing agents, reducing agents, metal nitrates.
explosive limit 8%, 65°F
Odor Type odorless
Water Solubility  750 g/L (20 ºC)
Sensitive  Hygroscopic
λmax λ: 260 nm Amax: 0.20
λ: 280 nm Amax: 0.10
JECFA Number 218
Merck  14,2326
BRN  782061
LogP -1.64
Citric Acid is an acidulant and antioxidant produced by mold fer- mentation of sugar solutions and by extraction from lemon juice, lime juice, and pineapple canning residue. it is the predominant acid in oranges, lemons, and limes. it exists in anhydrous and mono- hydrate forms. the anhydrous form is crystallized in hot solutions and the monohydrate form is crystallized from cold (below 36.5°c) solutions. anhydrous citric acid has a solubility of 146 g and mono- hydrate citric acid has a solubility of 175 g/100 ml of distilled water at 20°c. a 1% solution has a ph of 2.3 at 25°c. it is a hygroscopic, strong acid of tart flavor. it is used as an acidulant in fruit drinks and carbonated beverages at 0.25–0.40%, in cheese at 3–4%, and in jellies. it is used as an antioxidant in instant potatoes, wheat chips, and potato sticks, where it prevents spoilage by trapping the metal ions. it is used in combination with antioxidants in the processing of fresh frozen fruits to prevent discoloration.
CAS DataBase Reference 77-92-9(CAS DataBase Reference)
NIST Chemistry Reference 1,2,3-Propanetricarboxylic acid, 2-hydroxy-(77-92-9)
EPA Substance Registry System 77-92-9(EPA Substance)

Safety Data

Hazard Codes  Xi,C,T
Risk Statements 
R41:Risk of serious damage to eyes.
R36/37/38:Irritating to eyes, respiratory system and skin .
R36/38:Irritating to eyes and skin .
R37/38:Irritating to respiratory system and skin .
R34:Causes burns.
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S39:Wear eye/face protection .
S37/39:Wear suitable gloves and eye/face protection .
S24/25:Avoid contact with skin and eyes .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36:Wear suitable protective clothing .
RIDADR  UN 1789 8/PG 3
WGK Germany  1
RTECS  GE7350000
HS Code  2918 14 00
Safety Profile
Poison by intravenous route. Moderately toxic by subcutaneous and intraperitoneal routes. Mildly toxic byingestion. A severe eye and moderate skin irritant. An irritating organic acid, some allergenic properties. Combustible liquid. Potentially explosive reaction with metal nitrates. When heated to decomposition it emits acrid smoke and fumes.
Hazardous Substances Data 77-92-9(Hazardous Substances Data)
LD50 in mice, rats (mmol/kg): 5.0, 4.6 i.p. (Gruber, Halbeisen)

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