Chemical elements
  Thorium
    Isotopes
    Energy
    Production
    Application
    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
      Thoria
      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

Metathorium Oxide






Metathorium Oxide is a peculiar, isomeric modification of the oxide, obtained by igniting the oxalate, or the hydroxide precipitated from dilute solution at low temperature. When hydrochloric or nitric acid is evaporated with this oxide a syrupy residue is obtained which dissolves in water, forming an opalescent liquid. These solutions contain salts of metathorium oxide, which are reprecipitated by the addition of the corresponding acids, in which they are insoluble. These phenomena were first observed by Berlin, Bahr, and Cleve; and it was thought by Bahr that they were due to the oxide of a new metal, whilst Locke considered that the thoria had been reduced to Th3O5. The subject has been further investigated by Wyrouboff and Verneuil and by Stevens. According to Wyrouboff and Verneuil the product of the careful ignition of thorium oxalate, nitrate, chloride, or hydroxide is a mixture of two polymerides of thoria, which on account of polymerisation can combine additively with nitric acid to form salts of the empirical composition (ThO2)6.HNO3 and (ThO2)5.2HNO3. From analogy with corresponding cerium salts these nitrates are believed to have the molecular composition

(ThO2)24.4HNO3 and (ThO2)10.4HNO3.

Stevens believes that metathorium oxide is not Th3O5, but has the same composition as ordinary thoria. When prepared from the oxalate and containing some water it combines with dry hydrogen chloride, forming metathorium oxychloride, which is represented by the formula ThO2.xThCl4, and dissolves in water, forming a solution which is clear if 9-10 per cent, of chlorine is present, and is opalescent when more basic. It resembles metastannic chloride in properties, and does not give a precipitate with silver nitrate. Metathorium hydroxide is obtained by precipitating the chloride with ammonia; Stevens regards it as metathoric acid and as analogous to metastannic acid.

It would appear from the work of Ruer on colloidal zirconium hydroxide that the reason silver nitrate does not precipitate chloride from metathorium chloride solution is that the latter is colloidal and has the power also of retaining silver chloride in the colloidal form.


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