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Oxalic Acid uses, facts, tips and instructions   Oxalic acid is an organic chemical compound, the simplest dicarboxylic acid. Found in many plants (including sorrel and rhubarb), it takes the form of a white powder or crystals, without a distinct smell. It is obtained by heating sodium formate to approximately 400 ° C to form sodium oxalate which is then converted to oxalic acid with dilute sulfuric acid. Another method is to pass carbon dioxide over metallic sodium or potassium at 360 ° C, and oxidize ethylene glycol or oxidize many other organic compounds (e.g. sugars) with nitric acid.Oxalic acid...