Citric acid

SIAL/251275 - ACS reagent, ≥99.5%

Synonym: 2-Hydroxy-1,2,3-propanetricarboxylic acid; 2-Hydroxypropan-1,2,3-tricarboxylic acid

CAS Number: 77-92-9
Empirical Formula (Hill Notation): C₆H₈O₇
Molecular Weight: 192.12
EC Number: 201-069-1
MDL Number: MFCD00011669
Linear Formula: HOC(COOH)(CH₂COOH)₂
Product Type: Chemical

Catalog Number	PKG Qty.	Price


45-251275-5G	5 g	$48.80 1/EA	Add To Favorites
45-251275-100G	100 g	$52.20 1/EA	Add To Favorites
45-251275-500G	500 g	$87.10 1/EA	Add To Favorites
45-251275-2.5KG	2.5 kg	$299.00 1/EA	Add To Favorites
45-251275-12KG	12 kg	$845.00 1/EA	Add To Favorites

This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material.

This image depicts SKU: 251275-100G

Properties
Descriptions
Safety Info.
Basic Data

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%
assay	≥99.5%
cation traces	Fe: ≤3 ppm
	Pb: ≤2 ppm
expl. lim.	8 %, 65 °F
form	crystals
grade	ACS reagent
ign. residue	≤0.02%
impurities	Substances carbonizable by hot sulfuric acid, passes test
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
mp	153-159 °C (lit.)
pKa	(1) 3.13, (2) 4.76, (3) 6.4
Quality Level	200
SMILES string	OC(=O)CC(O)(CC(O)=O)C(O)=O

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.
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.
Legal Information:	Redi-Dri is a trademark of Sigma-Aldrich Co. LLC
Other Notes:	Go to Redi-Dri^™ Product Listing 791725
Packaging:	1, 2.5 kg in poly bottle
Packaging:	12 kg in fiber drum
Packaging:	5, 100, 500 g in poly bottle

Symbol	GHS07
Signal word	Warning
Hazard statements	H319
Precautionary statements	P264 - P280 - P305 + P351 + P338 - P337 + P313
Hazard Codes	Xi
Risk Statements	36
Safety Statements	26
RIDADR	NONH for all modes of transport
WGK Germany	WGK 1
Flash Point(F)	Not applicable
Flash Point(C)	Not applicable

Purity	≥99.5%
mp	153-159 °C (lit.)
UNSPSC	12352100

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