Oxalic Acid or Ethanedioic Acid
(COOH)2 or (C2H2O4)
Oxalic acid is first member of dicarboxylic series.
It happens as potassium hydrogen oxalate in the wood sorel, rhubarb and other plants of oxalis group and as calcium oxalate in plants of rumex family.
It is discovery in the form of calcium oxalate in stony deposits in kidneys and bladdar in human body.
Oxalic acid present in tomatoes.
(1) Methods of Preparation
(i) By oxidation of ethylene glycol with acidified potassium dichromate
(ii) By hydrolysis of cyanogen with conc. hydrochloric acid : 
(iii) By heating sodium or potassium in a current of carbon dioxide at 360°C
(iv) Laboratory preparation
(v) Industrial method
Sodium formate is obtained by passing carbon monoxide over fine powdered of sodium hydroxide.
The sodium oxalate thus formed is dissolved in water and calcium hydroxide is added. The precipitate of calcium oxalate is formed which is separated by filtration. It is decomposed with calculated quantity of dilute sulphuric acid.
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