| Acid Calcium Plumbate, CaPbO3.H2PbO3, or calcium di-plumbate, is formed along with lime by heating the metaplumbate with water under pressure. By heating, half the water is driven off at 310° C., probably forming the intermediate compound, calcium tetraplumbate, Ca2H2Pb4O11, and the remainder at 380°-400° C. |