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 Carbonate

The precipitate obtained by adding sodium carbonate to the solution of a thorium salt is a basic carbonate which dissolves readily in excess of carbonate solution, forming a complex salt. This property serves to distinguish and separate thoria from other rare earths whose carbonates do not so readily dissolve in excess of alkali carbonate. From this solution alcohol precipitates the complex salt Na6Th(CO3)5.12H2O as a crystalline powder; the following salts have also been obtained: K6Th(CO3)5.10H2O, (NH4)2Th(CO3)3.6H2O, Tl6Th(CO3)5.

According to Chauvenet thorium oxide absorbs carbon dioxide, forming orthocarbonates. Under ordinary pressure the compound 2Th(OH)4.CO2 is produced, but under 30-40 atmospheres the ortho-carbonate ThCO4.2H2O. Under this latter pressure the anhydrous oxide yields ThCO4.6ThO2. The addition of sodium carbonate to a thorium salt solution forms ThCO4.8H2O, which loses 6H2O in a vacuum, and on heating to 120° C. forms the basic salt 2ThCO4.2ThO2.3H2O.

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