Note 83 bis — Chapter XI · THE HALOGENS: CHLORINE, BROMINE, IODINE, AND FLUORINE

Ditte (1890) obtained many iodates of great variety. A neutral salt, 2(LiIO3)H2O, is obtained by saturating a solution of lithia with iodic acid. There is an analogous ammonium salt, 2(NH4IO3)H2O. He also obtained hydrates of a more complex composition, such as 6(NH4IO3)H2O and 6(NH4IO3)2H2O. Salts of the alkaline earths, Ba(IO3)2H2O and Sr(IO3)2H2O, may be obtained by a reaction of double decomposition from the normal salts of the type 2(MeIO3)H2O. When evaporated at 70° to 80° with nitric acid these salts lose water. A mixture of solutions of nitrate of zinc and an alkaline iodate precipitates Zn(IO3)22H2O. An anhydrous salt is thrown out if nitric acid be added to the solutions. Analogous salts of cadmium, silver, and copper give compounds of the type 2Me′IO34NH3 and Me″(IO3)24NH3, with gaseous ammonia (Me′ and Me″ being elements of the first (Ag) and second (Cd, Zn, Cu) groups). With an aqueous solution of ammonia the above salts give substances of a different composition, such as Zn(IO3)2(NH4)2O, Cd(IO3)2(NH4)2O. Copper gives Cu(IO3)24(NH4)2O and Cu(IO3)2(NH4)2O. These salts may be regarded as compounds of I2O5, and MeO and (NH4)2O; for example, Zn(IO3)2(NH4)2O may be regarded as ZnO(NH4)2OI2O5, or, as derived from the hydrate, I2O52H2O = 2(HIO3)H2O.