Oxalic acid dihydrate

SIAL/247537 - ACS reagent, ≥99%

Synonym: Ethanedioic acid dihydrate

CAS Number: 6153-56-6
Empirical Formula (Hill Notation): C₂H₂O₄ · 2H₂O
Molecular Weight: 126.07
EC Number: 205-634-3
MDL Number: MFCD00149102
Linear Formula: HO₂CCO₂H · 2H₂O
Product Type: Chemical

Catalog Number	PKG Qty.	Price


45-247537-100G	100 g	$59.20 1/EA	Add To Favorites
45-247537-500G	500 g	$127.00 1/EA	Add To Favorites
45-247537-2.5KG	2.5 kg	$361.00 1/EA	Add To Favorites

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This image depicts SKU: 247537-100G

Properties
Descriptions
Safety Info.
Basic Data

anion traces	chloride (Cl^-): ≤0.002%
	sulfate (SO₄^2-): ≤0.005%
assay	≥99%
	99.5-102.5% (ACS specification)
cation traces	Ca: ≤0.001%
	Fe: ≤2 ppm
	heavy metals: ≤5 ppm (by ICP-OES)
form	solid
functional group	carboxylic acid
grade	ACS reagent
ign. residue	≤0.01%
impurities	H₂SO₄, passes test (darkened)
	≤0.001% N compounds
	≤0.005% insolubles
InChI	1S/C2H2O4.2H2O/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);2*1H2
InChI key	GEVPUGOOGXGPIO-UHFFFAOYSA-N
mp	104-106 °C (lit.)
Quality Level	200
SMILES string	[H]O[H].[H]O[H].OC(=O)C(O)=O
vapor density	4.4 (vs air)
vapor pressure	<0.01 mmHg ( 20 °C)

Application:	Oxalic acid dihydrate may be used: • As a catalyst in the preparation of tetrahydroquinoline derivatives via imino Diels-Alder reaction. • As a homogeneous catalyst in the preparation of highly functionalized piperidines via multi-component reaction. • As an oxidant for the formation of triazolinediones from corresponding urazoles and bisurazoles via oxidation. • In the transformation of thiols to nitrosothiols by reacting with sodium nitrite.
General description:	Oxalic acid dihydrate is a promising candidate as a phase change material (PCM) for use in thermal energy storage (TES) technology due to its high heat of fusion and energy storage density/price ratio in comparison to other salt hydrates PCMs.
Packaging:	100, 500 g in poly bottle
Packaging:	2.5 kg in poly bottle

Symbol	GHS05,GHS07
Signal word	Danger
Hazard statements	H302 + H312 - H318
Precautionary statements	P264 - P270 - P280 - P301 + P312 - P302 + P352 + P312 - P305 + P351 + P338
Hazard Codes	Xn
Risk Statements	21/22-41
Safety Statements	26-36-37-39
RIDADR	NONH for all modes of transport
WGK Germany	WGK 1

Purity	≥99%; 99.5-102.5% (ACS specification)
mp	104-106 °C (lit.)
UNSPSC	12352100

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