Rubidium selenate, Rb₂SeO₄

Neutralization of selenic acid with rubidium carbonate yields the Rubidium selenate, Rb₂SeO₄ in colourless crystals, of density 3.8995 at 20° C. At 12° C. its solubility is 158.9 grams in 100 grams of water. Addition of an equivalent proportion of selenic acid converts it into rubidium hydrogen selenate, RbHSeO₄, its solubility at 17.5° C. being 140 grams in 100 grams of water.