SIR WILLIAM CKOOKES ON SCANDIUM. 29 



Theory. Experiment. 



0). (2). 



1475 14-74 



85-25 85-26 



302-194 100-00 100-00 lOO'OO 



When the above hydrate is dried over a water-bath, it does not fuse, but becomes 

 pasty and anhydrous 



Sc(N0 3 ).,. 



Analysis, 



(1) 38795 grs. left on ignition 11'449 grs. of scandia, = 7'4141 grs. of scandium. 



(2) H'026 grs. of nitrate left on ignition 3'233 grs. of scandia, = 2'0936 grs. of 



scandium. 



(3) 14-618 grs. of nitrate left on ignition 4'287 grs. of scandia, = 27762 grs. of 



scandium. 



Synthesis. 



(4) 4'246 grs. of ignited scandia (= 27496 grs. of scandium) were covered in a 



crucible with strong nitric acid and put into a hot oven at 100 for seven 

 hours. All excess of nitric acid disappeared, and a clear oily liquid 

 remained which solidified on cooling. No crystals were seen, but the 

 substance resembled glass. The solid nitrate weighed 14 '008 grs. 



(5) 3'233 grs. of scandia (= 2'0936 grs. of scandium), treated as described in the 



last experiment, formed 11 "026 grs. of nitrate. 



Theory. Experiment. 



230-13 100-00 100-00 lOO'OO lOO'OO lOO'OO lOO'OO 



When the hydrated nitrate is dried in vacuo at 100 for seventeen hours it becomes 



a basic nitrate 



ScOH(N0 3 ) 2 ,H 2 0. 



Analysis. 

 21-679 grs. of this basic nitrate lost on ignition 14'475 grs., and left 7 '2 04 grs. of 



scandia, = 4'665 grs. of scandium. 



