Dry Test - Recognition of Substances by Action of Heat

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  • Identification of solids by the action of heat:
  • Ammonium salt 
  • PbO2, Pb3O4, HgO, KNO3, NaNO3
  • Carbonate and bicarbonate (except K2CO3 and Na2CO3
  • Hydrated salt
  • Sulphite or sulphate
  • Lead compounds decompose to give lead monoxide; PbO
  • Zinc compounds decompose on heating to give zinc oxide 
  • Copper compound decomposes to give black copper oxide CuO.
  • Some naturally occurring acids:
  • Acetic acid
  • Citric acid
  • Butyric acid 
  • Hydrochloric acid
  • Formic acid
  • Lactic acid
  • Malic acid
  • Oleic acid
  • Stearic acid
  • Tartaric acid
  • Uric acid
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