376 SIR WILLIAM CEOOKES ON SCANDIUM. 



Theory. Experiment. 



(1). (2). 



21-47 21-04 



78-53 78-96 



209-14 100-00 100-00 lOO'OO 



SCANDIUM RACEMATE, 



CH(OH)COO V 

 | >Sc(OH),4H 2 0. 



CH(OH)COCr 



Scandium racemate is prepared in a similar manner to the tartrate. The two salts, 

 however, are not quite similar. The racemate comes down less plentifully on boiling, 

 and it is not anhydrous as is the tartrate, but contains four molecules of water, one of 

 which is driven off at 115. 



Equal weights of tartaric and racemic acids were dissolved in separate bottles of 

 water, and equal quantities of scandium hydroxide added to each bottle, the amount 

 being chosen so that all dissolved except a small quantity. The two bottles were 

 shaken in the cold for half an hour and filtered. The clear solutions were well boiled. 

 A precipitate was formed in each, but that in the tartrate was double that in the 

 racemate. 



Analysis. 



4'835 gr. of scandium racemate, heated to a temperature of 115 in a hot-air bath, 

 lost 0-322 gr. of water and left on ignition 1'168 gr. of scandia, = 07564 gr. 

 of scandium. 



Theory. Experiment. 



15-64 

 7770 



6-66 



281-204 100-00 100-00 



SCANDIUM L^VO-TARTRATE. 



CH(OH)COO N 

 CH(OH)COO' 

 Scandium Isevo-tartrate is prepared in a similar way to the tartrate. Dried in a 



>Sc(OH),2H 2 O. 

 CH(OH)CO(r 



