Rubidium hydrogen carbonate, RbHCO₃

The primary carbonate is produced by saturating a concentrated aqueous solution of rubidium carbonate with carbon dioxide. It dissolves readily in water, the slightly alkaline solution being decomposed by heat, with evolution of carbon dioxide. The heat of solution at 15° C. is -4.731 Cal., and that of formation from its elements 231.92 Cal. The dissociation-pressure has been investigated by Caven and Sand.