34 



SIR WILLIAM CROOKES ON SCANDIUM. 



Theory. Experiment. 



16-52 



Sc 44-100 16-26 



OH -J 



2(C 3 H 7 COO) . . V227-152 8374 



2II 2 . . . J 



271-252 100-00 



SCANDIUM ISO-VALERATE, 



83-48 



100-00 



Scandium hydroxide is readily attacked by aqueous iso-valeric acid, forming a white 

 amorphous salt, soluble in cold water, precipitated on boiling, and again dissolved on 

 cooling. Dried over sulphuric acid the iso-valerate has the composition 



(C 4 H 9 COO) 2 Sc(OH),2H 2 0. 



Analysis. 



10-902 grs. of scandium iso-valerate left on ignition 2'493 grs. of scandia, 



Theory. Experiment. 



14-80 



85-20 



= 1'614 grs. of scandium. 



299-284 



100-00 



100-00 



SCANDIUM OXALATE, 



Sc 2 (CA) 3 ,5H 2 0. 



Scandium oxalate comes down as a white crystalline powder when oxalic acid or 

 ammonium oxalate is added to a solution of scandium. If much free mineral acid is 

 present the precipitation is not immediate ; it begins by a cloudiness, which in a few 

 minutes increases to a crystalline precipitate, a little scandium oxalate remaining in 

 the solution. It is slightly soluble in water, weak acids, and more so in solution 

 of ammonium oxalate. On boiling a mixed oxalate from wiikite in a solution 

 of ammonium oxalate the portion dissolved was richer in scandium than the 

 insoluble part. Attempts were made to effect a separation of scandia from the 

 accompanying earths by making use of this fact. A mixed oxalate of crude earths 

 was boiled in a strong solution of ammonium oxalate and then filtered, and this 



