92 



L. F. Nilson, 



SELENITES OF CERIUM, 

 l. 5 / 6 -Selenite: Ce 4 .O u .5SeO + 30H 2 O. 



Sulpiiate of cerium being acted upon with a solution of selenite of 

 sodium in excess, a white, insoluble, voluminous, amorphous precipitate 

 was afforded. 



Analyses : 



1) 0.5625 gr. salt gave 0.127 gr. selenium or 0.1784 gr. selenious acid 

 and 0.367 gr. sulphate of cerium, containing 0.2108 gr. oxide of cerium. 



2) 0.587 gr. salt gave 0,1335 gr. selenium or 0.1876 gr. selenious acid and 

 0.382 gr. sulphate of cerium, containing 0.2195 gr. oxide of cerium. 



In 100 parts: 



found calculated 



i. 2. 



Oxide of cerium .. . 37.48 37.39 2Ce 2 3 648 37.17 



Selenious acid .... 31.72 31.96 5Se0 2 555 31.84 



Water (loss) 30.80 30.65 30H 2 O 540 30.99 



100.00 100.00 1743 100.00 



From this basic salt the following have been prepared by digesting 

 with selenious acid at a moderate heat. The neutral salt was obtained by 

 adding 1, 4 / 3 -selenite by adding 7, and the diselenite by adding 19 mol. 

 andydride to 1 mol. basic salt. 



2. Neutral : Ce 2 .0 G .3SeO 4- 1 2H 2 0. 



In the above manner this salt was obtained in form of a white, 

 amorphous, insoluble mass. 



Analyses: 



1) 0.5015 gr. salt gave 0.134 gr. selenium or 0.1883 gr. selenious acid 

 and 0.315 gr. sulphate of cerium, containing 0.181 gr. oxide of cerium. 



2) 0.4122 gr. salt gave 0.U05 gr. selenium or O.1553 gr. selenious acid 

 and . 2667 gr. sulphate of cerium, containing . 1532 gr. oxide of cerium. 



