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CAS RN | 6153-56-6 | Oxalic Acid Sometimes called Ethanedioic acid dihydrate, this reducing agent presents as a crystalline powder that can range from white in color to yellow-green and should be stored at room temperature. It is stable but contact with metals should be avoided.

The amount of oxalic acid can be calculated by multiplying the molecular weight of the oxalic acid to the molarity of the solution and volume of the solution in liters. So the molecular mass of oxalic acid is 126 g/mol.

Oxalic acid is a relatively strong "weak acid" with pKa₁=1.27 and pKa₂=4.28. Oxalic acid exhibits many of the reactions characteristic of other carboxylic acids.