40 



Sc 3 



Q 



H 17 



9 



SIR WILLIAM CEOOKES ON SCANDIUM. 

 Theory. 



132-300 27-25 

 192'000-j 



17-136 > 353-13(5 72'75 

 144-OOOJ 



485-436 100-00 



Experiment. 



(1). 

 27-42 



72-58 



(2). 

 27-32 



72-68 



100-00 100-00 



The above basic salt is formed by the union of two molecules of the ortho-toluate, 

 C 8 H 7 O 3 Sc, with one molecule of scandium hydroxide, Sc(OH) 3 . 



SCANDIUM META-TOLUATE, 



= (C 8 H 7 O a ) 3 ScOH,3H 3 = C 18 H 1B O 6 Sc,3H 3 O. 



This salt is formed by double decomposition between ammonium meta-toluate and 

 scandium nitrate solutions. It comes down as a voluminous white curdy precipitate, 

 insoluble in water. 



Analysis. 



IS'702 grs. of the meta-toluate, dried in racuo over sulphuric acid at the ordinary 

 temperature, left on ignition 2'673 grs. of scandia, = 17310 grs. of scandium. 



385-268 



100-00 



100-00 



SCANDIUM PARA-TOLUATE, 

 2 ScOH,3H 2 O = (C 8 H 7 O 2 ) 2 ScOH,3H 2 = C 16 H 18 O 6 Sc,3H 2 O. 



Scandium para-toluate is formed by double decomposition in the same manner as 

 the ortho-toluate, and has the same composition. It separates with three molecules 

 of water, which are not driven off at 150. It is a white curdy precipitate insoluble 

 in hot' or cold water. 



