Chemical elements
    Physical Properties
    Chemical Properties
      Thorium Hydride
      Thorium Fluoride
      Thorium Oxyfluoride
      Potassium Thorifluoride
      Thorium Chloride
      Thorium Oxychloride
      Complex Thorium Chlorides
      Thorium Bromide
      Thorium Oxybromide
      Thorium Iodide
      Thorium Dioxide
      Metathorium Oxide
      Thorium Hydroxide
      Thorium Superoxide
      Thorium Sulphide
      Thorium Sulphite
      Thorium Sulphate
      Complex Thorium Sulphates
      Thorium Selenite
      Thorium Selenate
      Thorium Nitride
      Thorium Nitrate
      Thorium Orthophosphate
      Thorium Arsenates
      Thorium Carbide
      Thorium Carbonate
      Thorium Formate
      Thorium Acetate
      Thorium Oxalate
      Thorium Tartrate
      Thorium Acetylacetone
      Thorium Silicide
      Thorium Silicate
      Thorium Borides

Thorium Nitrate, Th(NO3)4

By the crystallisation of a dilute nitric acid solution of thorium hydroxide or carbonate large deliquescent tablets of the salt Th(NO3)4.12H2O are produced, which are very soluble in water and alcohol. By the crystallisation of a warm aqueous solution the hydrate Th(NO3)4.6H2O has been obtained, and from a strongly acid solution the hydrate Th(NO3)4.5H2O. A dilute solution of the nitrate is slowly hydrolysed with separation of a basic salt. Thorium nitrate is employed for the manufacture of incandescent-gas mantles. For this purpose it is obtained in granular masses containing about 48 per cent, of thoria, which corresponds nearly to the formula Th(NO3)4.4H2O. When strongly ignited the nitrate leaves a residue of pure white oxide. This is dense and harsh when the nitrate is quite pure, but if 1 to 2 per cent, of sulphuric acid is present in the nitrate the salt swells like "Pharaoh's serpents" during ignition, and yields a soft, voluminous ash from six to ten times as bulky as that obtained from the pure nitrate. Most mantle-makers prefer a nitrate that yields the bulky ash, and hence commercial thorium nitrate almost invariably contains from 1 to 2 per cent, of sulphuric acid.

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