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 chloride, RbCl

The Rubidium chloride, RbCl, is produced by the interaction of hydrochloric acid and rubidium carbonate, and also by heating rubidium chloroplatinate. It forms lustrous cubes, stated to melt at 710° C., 712° to 713° C., 713° C., 714° C., 717° C., and 726° C., and to boil at 1383° C. The vapour-pressure in atmospheres is given by the expression

log p = -37800/4.57T+4.998.

Its density is recorded as 2.209, 2.706 at 22.9° C. (Buchanan), and 2.762 at 20° C. (Haigh). Its specific heat is 0.112 between 16° and 45° C., and the latent heat of fusion per gram is 0.038 Cal. The heat of formation in aqueous solution from the elements is 105.94 Cal. The salt does not form hydrates, but is very soluble in water.

Solubility of Rubidium Chloride

Temperature, °C.0102030405060708090100
Grams of RbCl per 100 grams of water77.084.491.197.6103.5109.3115.5121.4127.2133.1138.9

The boiling-point of the saturated solution in contact with excess of the salt is 113.71° C. at 760 mm. pressure, and the heat of solution is -4.5 Cal. At 25° C. 100 grams of ethyl alcohol dissolve 0.078 gram. The salt unites with free halogens, yielding various polyhalides, and also forms double chlorides with other metallic chlorides. It exhibits radioactivity.

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