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Citric acid Structure

Citric acid

Chemical Properties

Melting point 153-159 °C (lit.)
Boiling point 248.08°C (rough estimate)
Density  1.67 g/cm3 at 20 °C
vapor density  7.26 (vs air)
vapor pressure  <0.1 hPa (20 °C)
refractive index  1.493~1.509
FEMA  2306 | CITRIC ACID
Flash point 100 °C
storage temp.  2-8°C
solubility  Citric acid also dissolves in absolute (anhydrous) ethanol (76 parts of citric acid per 100 parts of ethanol) at 15 °C.
form  grit
pka 3.14(at 20℃)
color  White
PH 3.24(1 mM solution);2.62(10 mM solution);2.08(100 mM solution);
Odor Odorless
explosive limit 8%, 65°F
Water Solubility  soluble in Water (1174g/L at 10°C, 1809g/L at 30°C, 3825g/L at 80°C).
Sensitive  Hygroscopic
λmax λ: 260 nm Amax: 0.20
λ: 280 nm Amax: 0.10
Merck  14,2326
JECFA Number 218
BRN  782061
Stability Stable. Incompatible with bases, strong oxidizing agents, reducing agents, metal nitrates.
InChIKey KRKNYBCHXYNGOX-UHFFFAOYSA-N
CAS DataBase Reference 77-92-9(CAS DataBase Reference)
FDA 21 CFR 184.1033; 582.1033; 582.6033; 145.145; 155.130; 310.545
Substances Added to Food (formerly EAFUS) CITRIC ACID
SCOGS (Select Committee on GRAS Substances) Citric acid
EWG's Food Scores 1-2
FDA UNII XF417D3PSL
NIST Chemistry Reference 1,2,3-Propanetricarboxylic acid, 2-hydroxy-(77-92-9)
ATC code A09AB04
Pesticides Freedom of Information Act (FOIA) Citric acid
EPA Substance Registry System Citric acid (77-92-9)
Cosmetics Info Citric Acid

Safety

Symbol(GHS)
Signal wordWarning
Hazard statements H319-H335
Precautionary statements P261-P264-P271-P280-P304+P340+P312-P305+P351+P338
Hazard Codes  Xi,C,T
Risk Statements  41-36/37/38-36/38-37/38-34-36-35-61-60
Safety Statements  26-39-37/39-24/25-36/37/39-45-36-53
RIDADR  UN 1789 8/PG 3
WGK Germany  1
RTECS  GE7350000
9
TSCA  Yes
HS Code  2918 14 00
Hazardous Substances Data 77-92-9(Hazardous Substances Data)
Toxicity LD50 in mice, rats (mmol/kg): 5.0, 4.6 i.p. (Gruber, Halbeisen)
NFPA 704:
1
2 0

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