Molecular Formular :C2H2O4·2H2O
Molecular Weight: 126.07

Property: Oxalic acid is colorless transparent crystal or
white powder, Acidic flavor and toxic, the specific gravity is
1.653 ( 19/4℃ ) and melting point is 101 ~ 102℃. 
The specific gravity of anhydrous substance is 1.90 (
17/4℃ ) , melting point is 189.5℃ (decompose ) and subliming
at about 157℃. Soluble in water, ethanol and aether.
Oxylic acid is one of the strong organic acids, will lose
moisture when combining with strong sulfuric acid and decomposes into carbon dioxide and carbon monoxide. 
Oxalic acid is easy to oxidize into carbon dioxide and water and can neutralize with carbon species and make oxalate.