Answer :

(CaC₂)O₄. H₂O decomposes under heat in three distinct steps, as the total reaction equation is depicted below. To create anhydrous calcium oxalate,

  • step 1 includes the loss of water through crystallization.
  • In step 2, calcium oxalate thermally breaks down to calcium carbonate while losing carbon monoxide.
  • If they are insoluble in acetic acid and caustic alkali, soluble in hydrochloric and sulfuric acid without effervescence, and display a progressive separation of needle-like calcium sulphate crystal when mixed in a 50% sulfuric acid solution, they can be classified as calcium oxalate.
  • It burns in air or pure oxygen to form the oxide and reacts rapidly with warm water (and more slowly with cold water) to produce hydrogen gas and calcium hydroxide. On heating, calcium reacts with hydrogen, halogens, boron, sulfur, carbon, and phosphorus.

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