SIK WILLIAM CROOKES ON SCANDIUM. 371 



Theory. Experiment. 



(1). (2). 



10-58 1075 



89-42 89-25 



419-32 100-00 100-00 lOO'OO 



3 - 863 gr. of scandium lactate, dried at 120, left on ignition 0'747 gr. of scandia, 

 = 0-4837 gr. of scandium. 



Theory. Experiment. 



12-52 



87-48 



347-25 100-00 lOO'OO 



The scandium nitrate used in the preparation of the lactate contained traces of 

 yttrium and ytterbium. The scandia resulting from the ignition of the lactate 

 showed no appreciable diminution in the amount of impurity present. The mother- 

 liquors, however, appeared free from both yttrium and ytterbium. The impurities in 

 the lactate could only be detected spectroscopically, and were not present in sufficient 

 quantities to interfere with the properties of the lactate, or to increase perceptibly 

 the atomic weight of the scandium. 



SCANDIUM MALONATE, 



Scandium hydroxide dissolves readily in a cold aqueous solution of malonic acid, 

 and the solution when heated deposits a semi-transparent granular precipitate, having 

 no crystalline appearance under the microscope. This precipitate partially dissolves 

 on cooling. 



If this solution is boiled for some time a dense precipitate is formed, which on 

 cooling does not re-dissolve. 



When a cold solution of scandium malonate containing excess of malonic acid is 

 slowly heated on a water-bath, it becomes cloudy at first ; as the temperature rises 

 the liquid becomes clear, and a thick transparent gummy liquid sinks to the bottom. 

 If now the supernatant liquor is poured off and cold water poured on, the transparent 

 colloid-looking mass is slowly converted into a fine white crystalline powder. 



3 B 2 



