SIR WILLIAM CROOKES ON SCANDIUM. 383 



Analysis. 



4'830 gr. of scandium tetrachlorophthalate left on ignition 0'692 gr. of scandia, 

 = 0'4481 gr. of scandium. 



Experiment. 



Sc 44-10 9-36 9-28 



C 8 HC1 4 O 5 . . . . 318-85' 

 6H 3 O 108-10 



471-05 lOO'OO 100-00 



The scandia left on ignition was tested in the spectrograph and found to be quite 

 pure. Yttrium and ytterbium could be detected in the earth obtained from the 

 filtrate left after precipitating the tetrachlorophthalate. 



SCANDIUM 2-NlTROPHENYL-4'-TOLYLAMINE-4-,S!JLPHONATE. 



Sc(OH) + 5H 3 0. 



The sodium salt of this acid is dissolved in water and a solution of scandium nitrate 

 added. If the solutions are strong, a red precipitate falls ; if weak, the mixture 

 must be concentrated. On cooling, the scandium salt separates in feathery crystals 

 of a fine scarlet colour. It must be purified by re-crystallisation from a hot aqueous 

 solution. The crystals are slightly soluble in cold water. 



Heated in an air-bath to 105 for 48 hours, the scarlet crystals assume an orange- 

 yellow colour, losing water and becoming anhydrous. 



On being further heated, the salt decomposes rather suddenly, with intumescence, 

 leaving a carbonaceous residue, which at a red heat gradually burns white, leaving 

 scandia. 



Analysis. 



(1) 1-154 gr. of the scandium salt lost on heating 0'136 gr. of water. When 



heated to redness the same salt left 0'108 gr. of scandia, = 0'0699 gr. of 

 scandium. 



(2) 0-863 gr. of the salt, heated to 105, lost 0'095 gr. of water. 



