Citric Acid

Citric Acid

CAS No.: 77-92-9
Molecular Formula: C6H8O7
Molecular Weight: 192.12
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product description

Citric acid is a white, crystalline, weak organic acid present in most plants and many animals as an intermediate in cellular respiration. Citric acid contains three carboxyl groups making it a carboxylic, more specifically a tricarboxylic, acid.the name citrus originates from the Greek kedromelon meaning apple of melon for the fruit citron. Greek works mention kitron, kitrion, or kitreos for citron fruit, which is an oblong fruit several inches long from the scrublike tree Citrus medica. Lemons and limes have high citric acid content, which may account for up to 8% of the fruit's dry weight.


Chemical Properties

Melting point

153-159 °C (lit.)

Boiling point

248.08°C (rough estimate)

density

1.67 g/cm3 at 20 °C

bulk density

560kg/m3

vapor density

7.26 (vs air)

vapor pressure

<0.1 hPa (20 °C)

refractive index

1.493~1.509

FEMA

2306 | CITRIC ACID

Fp

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

biological source

synthetic

Odor Type

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: 0.20λ: 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

LogP

-1.64

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

Citric acid (77-92-9)


Safety Information

PropertyValue
Hazard symbolsXi, C, T
Hazard class codes41-36/37/38-36/38-37/38-34-36-35-61-60
Safety descriptions26-39-37/39-24/25-36/37/39-45-36-53
UN dangerous goods numberUN 1789 8/PG 3
WGK Germany1
RTECS numberGE7350000
F9
TSCATSCA listed
HS code2918 14 00
Storage class11 - Combustible solids
Hazard class (category)Eye irritation, Category 2
Specific target organ toxicity – single exposure, Category 3
Hazardous substances data77-92-9 (Hazardous Substances Data)
ToxicityLD50 in mice, rats (mmol/kg): 5.0, 4.6 i.p. (Gruber, Halbeisen)


Product Usage

Citric Acid is an acidulant and antioxidant produced by mold fermentation 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 monohydrate 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 monohydrate 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.

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