citric acid

CAS No. 77-92-9

Formula: C6H8O7
Basic Info

Citric acid is a weak organic tricarboxylic acid having the chemical formula C6H8O7. It occurs naturally in citrus fruits. In biochemistry, it is an intermediate in the citric acid cycle, which occurs in the metabolism of all aerobic organisms.
More than a million tons of citric acid are manufactured every year. It is used widely as an acidifier, as a flavoring and chelating agent.
A citrate is a derivative of citric acid; that is, the salts, esters, and the polyatomic anion found in solution. An example of the former, a salt is trisodium citrate; an ester is triethyl citrate. When part of a salt, the formula of the citrate ion is written as C6H5O73− or C3H5O(COO)33−.

Formula
C6H8O7
Molecular Weight
192.124
Exact Mass
192.027
LogP
-1.2485
PSA
132.13
Synonyms

3'-hydroxybiphenyl-3-carboxylic acid

1,2,3-Propanetricarboxylic acid, 2-hydroxy-

3-hydroxy-3-carboxy-pentanedioic acid

Citric acid

3'-hydroxy-3-biphenylcarboxylic acid

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Properties
Appearance & Physical State
White crystalline powder
Density
1.542g/cm3
Boiling Point
309.6ºC at 760 mmHg
Melting Point
153-154.5ºC
Flash Point
100ºC
Refractive Index
1.493~1.509
Water Solubility
750 g/L (20 ºC)
Stability
Stable. Incompatible with bases, strong oxidizing agents, reducing agents, metal nitrates.
Storage Condition
Store at RT.
Safety Info
RTECS
GE7350000
Safety Statements
S26-S37/39
WGK Germany
1
Risk Statements
R36/37/38
HS Code
2918140000
RIDADR
UN 1789 8/PG 3
Caution Statement
P280; P305 + P351 + P338; P337 + P313
Hazard Codes
Hazard Declaration
Spectrum
NMR Spectrum 1H NMR : 400 MHz in DMSO-d6
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IR Spectrum IR : KBr disc
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Mass Spectrum Mass
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Raman Spectrum Raman : 4880 A,200 M,powder
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