SIR WILLIAM CROOKES ON SCANDIUM. 373 



Theory. Experiment. 



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



Sc 44-100 24-35 24'04 24'32 24'13 



181-140 100-00 100-00 100-00 lOO'OO 



BASIC SCANDIUM MALONATE, 



PTT /COOSc(OH) 2 

 a2 \COOSc(OH) s ' 



When a large excess of scandium hydroxide is gently warmed with an amount of 

 malonic acid insufficient to dissolve it, and the filtered solution is well hoiled, a basic 

 salt is precipitated having the above composition. 



Analysis. 



16'754 gr. of the salt left on ignition 8'834 gr. of scandia, = 57207 gr. of 



scandium. 



Theory. Experiment. 



34-15 

 G5-85 



258-248 100-00 lOO'OO 



SCANDIUM MALATE, 



CH(OH)COC) 



| >Sc(OH),H 2 O. 



CH 2 COCK 



Malic acid and scandium hydroxide rubbed together with a little water react, and 

 the liquid when heated becomes clear. When gradually cooled a precipitate appears, 

 and at the ordinary temperature of the laboratory the solution is opaque and almost 

 solid. The precipitate consists of very fine granules, having no crystalline appearance 

 under the microscope ; it re-dissolves on being heated. 



Scandium malate formed in this manner is a granular white powder, soluble in hot 

 and difficultly soluble in cold water. It is easily soluble in ammonia, and is not 

 precipitated from the ammoniacal solution by dilute acetic or malic acid ; neither is 

 it precipitated by ammonium sulphide. The aqueous solution dries to a transparent 



