Chemical elements
    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 sulphides

The tetrahydrate of the mono sulphide, Rb2S,4H2O, is formed by the interaction of equivalent proportions of rubidium hydrogen sulphide and hydroxide, and is precipitated in colourless crystals by addition of alcohol and ether. The anhydrous salt is produced by the action of excess of rubidium on sulphur, the uncombined metal being removed by distillation in vacuum. It forms microscopic, white needles belonging to the cubic system, and isomorphous with those of the corresponding salt of potassium, but not with those of caesium monosulphide. Its density is 2.912, and it melts at the temperature of softening of glass. It dissolves in water with a hissing sound, the heat of solution being 24.6 Cal. The heat of formation of the solid from its elements is 87.1 Cal., and that from rubidium hydroxide and hydrogen sulphide is 8.0 Cal. Rubidium monosulphide is readily oxidized, is combustible, and weathers in air.

The monosulphide is converted by sulphur in an atmosphere of hydrogen into the pentasulphide, Rb2S5, deliquescent, red crystals melting at 223° to 224° C., and of density 2.618 at 15° C. When heated in nitrogen it yields the trisulphide, Rb2S3, consisting of hygroscopic, dark-yellow crystals melting at 213° C.; but in hydrogen the hygroscopic disulphide, Rb2S2, is formed, a substance melting about 420° C. and boiling above 950° C. Both the disulphide and the trisulphide yield a monohydrate. The tetrasulphide, Rb2S4, is formed by heating the monosulphide with the calculated amount of sulphur. It yields a yellow, crystalline dihydrate. Rubidium hydrogen sulphide, RbSH, is produced by saturating a solution of rubidium hydroxide with hydrogen sulphide.

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