yttrium (iii) chloride hexahydrate  yttrium(iii) chloride is an inorganic compound of yttrium and chloride. it exists in two forms, the hydrate (ycl3(h2o)6) and an anhydrous form (ycl3). other anions: yttrium(iii) fluoride; yttrium(iii) br... other cations: scandium(iii) chloride; lanthan... chemical formula: ycl3 boiling point: 1,482 °c (2,700 °f; 1,755 k)