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247537

Oxalic acid dihydrate

Name: Oxalic acid dihydrate
Brand: SIAL

ACS reagent grade, ≥99%, 99.5-102.5% (ACS specification), solid

Synonym(s):

Ethanedioic acid dihydrate

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About This Item

Linear Formula:

HO₂CCO₂H · 2H₂O

CAS Number:

6153-56-6

Molecular Weight:

126.07

NACRES:

NA.21

PubChem Substance ID:

24854873

eCl@ss:

39021701

UNSPSC Code:

12352100

EC Number:

205-634-3

MDL number:

MFCD00149102

Beilstein/REAXYS Number:

3679436

Assay:

≥99%, 99.5-102.5% (ACS specification)

Form:

solid

Grade:

ACS reagent

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Properties

Product Name

Oxalic acid dihydrate, ACS reagent, ≥99%

grade

ACS reagent

Quality Level

200

vapor density

4.4 (vs air)

vapor pressure

<0.01 mmHg ( 20 °C)

assay

≥99%, 99.5-102.5% (ACS specification)

form

solid

impurities

H₂SO₄, passes test (darkened), ≤0.001% N compounds, ≤0.005% insolubles

ign. residue

≤0.01%

pH

1.5 (10 g/L)

mp

104-106 °C (lit.)

solubility

water: 100 g/L at 25 °C

anion traces

chloride (Cl^-): ≤0.002%, sulfate (SO₄^2-): ≤0.005%

cation traces

Ca: ≤0.001%, Fe: ≤2 ppm, heavy metals: ≤5 ppm (by ICP-OES)

functional group

carboxylic acid

SMILES string

[H]O[H].[H]O[H].OC(=O)C(O)=O

InChI

1S/C2H2O4.2H2O/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);2*1H2

InChI key

GEVPUGOOGXGPIO-UHFFFAOYSA-N

Description

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.

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.

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pictograms

GHS05,GHS07

signalword

Danger

hcodes

H302 + H312,H318

pcodes

P264 - P280 - P301 + P312 - P302 + P352 + P312 - P305 + P351 + P338 - P362 + P364

Hazard Classifications

Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Dam. 1

Storage Class

11 - Combustible Solids

wgk

WGK 1

ppe

dust mask type N95 (US), Eyeshields, Gloves

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Effects of sodium chloride on the thermal behavior of oxalic acid dihydrate for thermal energy storage

Han L, et al

Applied Energy, 185, 762-767 (2017)

Imino Diels-Alder reactions catalyzed by oxalic acid dihydrate. Synthesis of Tetrahydroquinoline derivatives.

Nagarajan R and Perumal PT.

Synthetic Communications, 31(11), 1733-1736 (2001)

An Efficient Method for Production and Storage of Unstable S-Nitrosothiols Under Mild and Heterogeneous Condition with Sodium Nitrite and Oxalic Acid Dihydrate.

Zolfigol MA, et al.

Synthetic Communications, 29(13), 2277-2280 (1999)

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Global Trade Item Number

SKU	GTIN
247537-100G	04061825900803
247537-2.5KG	04061825900810
247537-500G	04061838634955