SIR WILLIAM CROOKES ON SCANDIUM. 363 



Theory. Experiment. 



(1). (2). (3). 



Sc . . . 44-10 5-49 5-42 5'41-| 



3(IO 3 ) . . 52476 65-35 \ 94 . 5g 94.59} 71 25 



13H 2 O . 234-21 29-16 J 2875 



803-07 100-00 100-00 lOO'OO lOO'OO 



i 



When the 18-hydrate is heated for some time to 100 it loses eight molecules of 

 water, and leaves a 10-hydrate, 



Sc(I0 3 ) 3 +10H 2 0. 



20 "983 gr. of 10-hydrate scandium iodate, decomposed in the manner already 

 described, yielded T907 gr. of scandia, = 1'235 gr. of scandium. 



Theory. Experiment. 



Sc . . 44-10 5-89 5- 



3(IO) 52476 70-06 ' 



10H 2 O ...... 180-16 24-05 



749-02 100-00 100-00 



When heated to about 250 scandium iodate loses all its water of crystallisation, 

 and becomes anhydrous, 



Sc(IO s ) 8 . 



15*409 gr. of anhydrous scandium iodate were dissolved in acid, precipitated with 

 ammonia, and the scandia collected. It weighed 1724 gr., = I'll 16 gr. of 

 scandium. 



Theory. Experiment. 



Sc 44-10 7-75 7-24 



3(IO 3 ) 524-76 92-25 9276 



568'86 100-00 lOO'OO 



SCANDIUM SULPHITE, 



Sc 2 (S0 3 ) 3 . 



Scandium sulphite is formed by mixing solutions of scandium chloride and sodium 

 sulphite. It forms a heavy white precipitate, soluble in excess of sodium sulphite 



3 A 2 



