Caesium carbonate, Cs₂CO₃

The normal Caesium carbonate, Cs₂CO₃, is produced by the interaction of the hydroxide and ammonium carbonate. It forms deliquescent, hydrated crystals, the anhydrous salt being very hygroscopic, and melting at red heat. When heated in vacuum it loses carbon dioxide. It is soluble in water to a very alkaline solution, the heat of solution being 11.84 Cal. At 20° C. the saturated solution contains 72.34 per cent, of the anhydrous salt. Several hydrates are known. The heat of formation of the anhydrous salt is 274.54 Cal.