Oxalic acid

Description

Oxalic acid · CAS 144-62-7 · C2H2O4. UNII 9E7R5L6H31. Melting Point: 189.5; Melting Point: 189.5 °C (DECOMPOSES); Melting Point: 189.5 °C.

Identification

CAS Registry Number	144-62-7
PubChem CID	971
Molecular formula	C2H2O4
IUPAC name	oxalic acid
UNII (FDA)	9E7R5L6H31

Computed Descriptors

Molecular Weight	90.03
XLogP3	-0.3
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	1
Exact Mass	89.99530854
Monoisotopic Mass	89.99530854
Topological Polar Surface Area	74.6
Heavy Atom Count	6
Formal Charge	0

Physical & Chemical Properties

Melting Point	189.5
Melting Point	189.5 °C (DECOMPOSES)
Melting Point	189.5 °C
Melting Point	372 °F
Solubility	50 to 100 mg/mL at 75 °F (NTP, 1992)
Solubility	220000
Solubility	220 mg/mL at 25 °C
Solubility	14%
Density	1.90 @ 17 DEG/4 °C, ALPHA
Density	1.9 g/cm³

Physical description & handling notes

• Oxalic acid is an odorless white solid. Sinks and mixes with water. (USCG, 1999)
• Dry Powder; Other Solid; Large Crystals; CBI; Liquid; Liquid; Other Solid
• Colorless, odorless powder or granular solid. [Note: The anhydrous form (COOH)2 is an odorless, white solid.]; [NIOSH]
• Solid
• HYGROSCOPIC COLOURLESS CRYSTALS OR WHITE POWDER.
• Colorless, odorless powder or granular solid.

Regulatory Status

Regulatory & Food Contact	FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS
GHS notification summary	0.2% (2 / 1282)

GHS Hazard Classification

GHS notification summary	0.2% (2 / 1282)
Reported hazard statements	H302, H312, H318 (31.1%), H315, H335, H361, H370, H372

Documented Uses

• Used in metal cleaning, chemical synthesis, dye and rubber manufacturing, and textile stripping/finishing; Also used as a disinfectant (swimming pool and drainage system) and bathroom sanitizer; [ACGIH] Several species of plants contain soluble and insoluble oxalate salts. [Olson, p. 360] Used in photography (toner and platinum printing); Also used as a mordant in textile dyeing; [www.ci.tucson.az.us/arthazards/medium.html]
• Using Disinfectants or Biocides [Category: Clean]
• Photographic Processing [Category: Other]
• Textiles (Printing, Dyeing, or Finishing) [Category: Industry]
• Textile arts [Category: Hobbies]
• Applying metallic patinas [Category: Hobbies]

Synonyms

oxalic acid; ethanedioic acid; 144-62-7; Aktisal; Aquisal; Oxiric acid; Kyselina stavelova; Oxaalzuur; Oxalsaeure; Acidum oxalicum; Acide oxalique; Acido ossalico; Ethanedionic acid; NCI-C55209; Ethane-1,2-dioic acid; DTXSID0025816

Frequently Asked Questions

What are the CAS number and molecular formula of Oxalic acid?

CAS 144-62-7; molecular formula C2H2O4; molecular weight — g/mol.

What other names is Oxalic acid known by?

oxalic acid, ethanedioic acid, 144-62-7, Aktisal, Aquisal, Oxiric acid.

What is the regulatory status of Oxalic acid?

Documented regulatory listings: FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS.

Is Oxalic acid classified as hazardous?

0.2% of GHS notifications report no hazard classification (2 of 1282).

What are the key physical properties of Oxalic acid?

Melting Point: 189.5; Melting Point: 189.5 °C (DECOMPOSES); Melting Point: 189.5 °C; Melting Point: 372 °F.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.