30 



SIR WILLIAM CROOKES ON SCANDIUM. 



Theory. Experiment. 



203-144 



lOO'OO 



lOO'OO 



Therefore the nitrate has lost one equivalent of nitric acid. 



When the nitrate is heated for twelve hours in a hot-air oven at a temperature of 

 120, a basic nitrate is left of the composition 



Sc 2 O(NO 3 ) 4 . 



Analysis. 



(1) G'550 grs. left on ignition 2'537 grs. of scandia, = l'G429 grs. of scandium. 



(2) 13'698 grs. left on ignition 5'287 grs. of scandia, = 3'4237 grs. of scandium. 



Theory. 



352-24 



100-00 



Experiment. 



100-00 



100-00 



SCANDIUM FORMATE, 

 (HCOO) 2 ScOH,H 2 O. 



Scandium hydroxide dissolves readily in formic acid. The solution is evaporated to 

 expel excess of acid and dissolved in water. It is then allowed to evaporate over 

 sulphuric acid in a desiccator, when it forms hard and lustrous crystals, easily soluble 

 in hot water and in alcohol. 



The formate readily decomposes when heated, and at a red heat leaves a white 

 residue of scandia. 



Analysis. 



8'895 grs. of crystallised formate left on ignition 3'650 grs. of scandia, 

 = 2'3G3 grs. of scandium. 



