Rubidium periodate, RbIO₄

When a mixture of rubidium iodate and hydroxide in hot concentrated solution is oxidized with chlorine, the Rubidium periodate, RbIO₄, is formed in colourless quadratic crystals isomorphous with those of potassium periodate, and with the density 3.918 at 16° C. At 13° C. its solubility is 0.65 gram in 100 grams of water.