Solubility of double alkali metal (Na, k) rare-earth (La, Ce) sulfates in sulfuric-phosphoric acid solutions at 20°C

The dependence of the solubility of NaLa(SO4)(2)(H2O)-H-., NaCe(SO4)(2)(H2O)-H-., KLa(So(4))(2)(H2O)-H-., and KCe(SO4)(2)(H2O)-H-. on the concentration of acids in sulfuric, phosphoric, and sulfuric-phosphoric acid solutions containing up to 36 wt % H2SO4 and 33.12 g1(-1) H3PO4 was studied at 20 degrees C.