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 sulphate, Rb2SO4

The Rubidium sulphate, Rb2SO4, forms rhombic crystals isomorphous with those of potassium sulphate, melting at 1074° C., the density at 20° C. being 3.6113, and at 60° C. 3.5943. It exists in two modifications, the transition-point being 657° C. The heat of formation from the elements is 344.68 Cal., and the heat of solution -6.66 Cal. at 15° C. The solubility is given in the appended table:

Solubility of Rubidium Sulphate

Temperature, °C.0102030405060708090100
Grams of Rb2SO4 per 100 g. of water36.442.648.253.558.563.167.471.475.078.781.8

The boiling-point of the saturated solution in contact with excess of sulphate is 103.5° C. at 760 mm. pressure. With aluminium and ferric sulphates it forms well-crystallized alums. It exhibits radioactivity.

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