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251275

Citric acid

Name: Citric acid
Brand: SIAL

ACS reagent grade, ≥99.5%, crystals

Synonym(s):

2-Hydroxy-1,2,3-propanetricarboxylic acid, 2-Hydroxypropan-1,2,3-tricarboxylic acid

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About This Item

Linear Formula:

HOC(COOH)(CH₂COOH)₂

CAS Number:

77-92-9

Molecular Weight:

192.12

NACRES:

NA.21

PubChem Substance ID:

24855122

eCl@ss:

39021801

UNSPSC Code:

12352100

EC Number:

201-069-1

MDL number:

MFCD00011669

Beilstein/REAXYS Number:

782061

Assay:

≥99.5%

Form:

crystals

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Properties

Product Name

Citric acid, ACS reagent, ≥99.5%

grade

ACS reagent

Quality Segment

200

assay

≥99.5%

form

crystals

expl. lim.

8 %, 65 °F

impurities

Substances carbonizable by hot sulfuric acid, passes test

ign. residue

≤0.02%

pKa

(1) 3.13, (2) 4.76, (3) 6.4

mp

153-159 °C (lit.)

anion traces

chloride (Cl^-): ≤0.001%, oxalate (C₂O₄^2-): passes test (limit about 0.003%), phosphate (PO₄^3-): ≤0.001%, sulfate (SO₄^2-): ≤0.002%

cation traces

Fe: ≤3 ppm, Pb: ≤2 ppm

functional group

carboxylic acid, hydroxyl

storage temp.

room temp

SMILES string

OC(=O)CC(O)(CC(O)=O)C(O)=O

InChI

1S/C6H8O7/c7-3(8)1-6(13,5(11)12)2-4(9)10/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)

InChI key

KRKNYBCHXYNGOX-UHFFFAOYSA-N

Gene Information

human ... SRC(6714)

Description

General description

Citric acid is a weak organic acid that is commonly used for pH adjustment, as a chelating agent, as a buffering agent, derivatization and as starting material for the synthesis of citrate esters and other compounds.

Application

Citric acid has been used to prepare:

Phosphate citrate buffer for use in enzyme-linked immunosorbent assay.
Citrate-stabilized ceria aqueous sol, which was employed in the synthesis of cerium oxide nanoparticles.
Citric acid-Na₂HPO₄-buffered stock solution for use in the determination of fecal urease activity.
Anticoagulant citrate dextrose solution A (ACD-A), which is employed during the isolation of blood-derived endothelial progenitor cells.

Citric acid has also been used:

In a novel process which allows controlling of the particle size during the synthesis of palladium cuboctahedrons.
To prepare citric acid-derived carbon nanodots (CNDs) by bottom-up carbonization method.
As a bi-component chelating agent for the synthesis of Li4Ti₅O₁₂ (lithium titanate oxide) by a novel sol–gel method.

Other Notes

Go to Redi-Dri^™ Product Listing 791725

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

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Pictograms

GHS07

Signal Word

Warning

Hazard Codes

H319,H335

Precautionary Statements

P261 - P264 - P271 - P280 - P304 + P340 + P312 - P305 + P351 + P338

Hazard Classifications

Eye Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class

11 - Combustible Solids

Flash Point (°F)

Not applicable

Flash Point (°C)