Chemical elements
  Rubidium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Rubidium hydride
      Rubidium fluoride
      Rubidium chloride
      Rubidium bromide
      Rubidium iodide
      Rubidium chlorate
      Rubidium perchlorate
      Rubidium iodate
      Rubidium periodate
      Rubidium monoxide
      Rubidium peroxides
      Rubidium hydroxide
      Rubidium peroxide hydrate
      Rubidium sulphides
      Rubidium sulphate
      Rubidium hydrogen sulphate
      Rubidium persulphate
      Rubidium thiosulphate
      Rubidium dithionate
      Rubidium trithionate
      Rubidium tetrathionate
      Rubidium selenate
      Rubidium tellurates
      Rubidium nitride
      Rubidium hydrazoate
      Rubidium nitrite
      Rubidium nitrate
      Rubidium phosphide
      Rubidium phosphates
      Rubidium carbide
      Rubidium carbonate
      Rubidium hydrogen carbonate
      Rubidium percarbonate
      Rubidium pentaborate
    PDB 1dge-461d

Rubidium hydride, RbH






The Rubidium hydride, RbH, has been prepared by a method analogous to that employed for sodium hydride. It can also be produced by heating rubidium carbonate with metallic magnesium in an atmosphere of hydrogen at 650° C. for five days. It is a white, crystalline substance, with density about 2. The vapour-tension for each temperature-interval of 10° between 350° and 450° C. corresponds with the values 100, 114, 130, 160, 200, 253, 322, 424, and 567 mm. respectively. A possible source of error may be the presence of carbon dioxide as the result of decomposition of the magnesium carbonate formed; but soda-lime was employed to absorb any carbon dioxide liberated, and the measurements were made rapidly. The tension increases rapidly to 85 mm. at 230° C., and then slowly to 100 mm. at 370° C.

This hydride is more stable than that of caesium, but less stable than that of sodium or of potassium. It is very reactive. When heated in vacuum at 300° C. it decomposes into its constituent elements. At ordinary temperatures it is attacked by the halogens. Carbon dioxide converts it into rubidium formate:

RbH+CO2=HCOORb.

Under reduced pressure sulphur dioxide converts it into rubidium hyposulphite, Rb2S2O4.


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