Description
Oxalic acid is a dicarboxylic acid with a appearance of white crystals. It’s main applications include cleaning or bleaching, especially for removal of rust. About 25% of produced oxalic acid is used as a mordant in dyeing processes. It is used in bleaches, especially for pulpwood.
Properties of Oxalic Acid
Chemical Formula: C2H2O4
Molecular Weight/ Molar Mass: 90.034 g·mol−1(anhydrous)
126.065 g·mol−1 (dihydrate)
Appearance: White crystals
Odor: Odorless
Density: 1.90 g·cm−3 (anhydrous, at 17 °C)
1.653 g·cm−3 (dihydrate)
Melting Point: 189 to 191 °C (372 to 376 °F; 462 to 464 K)
101.5 °C (214.7 °F; 374.6 K) Dihydrate
Solubility in Water: 90-100 g/L (20 °C)[2]
Solubility
237 g/L (15 °C) in ethanol
14 g/L (15 °C) in diethyl ether [3]
Vapor Pressure: <0.001 mmHg (20 °C)[4]
Acidity (pKa): 1.25, 4.14
Conjugate Base: Hydrogenoxalate
Magnetic susceptibility (χ): -60.05·10−6 cm3/mol
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