66 



L. F. Nilson, 



SELENITES OF CADMIUM, 

 l. Neutral: Cd.0 2 .SeO. 



Hydrate of cadmium being dissolved on heating in selenious acid, the 

 liquid suddenly deposited a salt in microscopical, feltred, long prisms with 

 the ends obliquely cut off. The compound is insoluble in water. 



Analyses: 



1) 1.001 gr. salt gave 0.3323 gr. selenium = 0.4669 gr. selenious acid and 

 0.5327 gr. oxide of cadmium. 



2) 1.0065 gr. salt gave 0.3333 gr. selenium = 0.4683 gr. selenious acid 

 and 0.5355 gr. oxide of cadmium. 



In 100 parts 



found calculated 



1. 2. 



Oxide of cadmium . . 53.22 53.20 CdO 128 53.55 

 Selenious acid .... 46.64 46.53 SeO" 111 46.45 



~99^86 99.73 239 TooToo 



2. Neutral: 2Cd.0 2 .Se0 + 3H 2 0. 



A solution of chloride of cadmium gave with selenite of sodium an 

 amorphous, white, insoluble precipitate. 



Analyses: 



1) 0.5405 gr. salt gave 0.158 gr. selenium = 0.222 gr. selenious acid and 

 0.435 gr. sulphate of cadmium = 0.2677 gr. oxide of cadmium. 



2) 0.5345 gr. salt gave 0.156 gr. selenium = 0.2192 gr. selenious acid and 

 0.432 gr. sulphate of cadmium = 0.2658 gr. oxide of cadmium. 



In 100 parts: 



experiment theory 



1. 2. 



Oxide of cadmium 49.53 49.73 2CdO 256 48.12 



Selenious acid . . 41.08 41.01 2Se0 2 222 41.73 



Water (loss) . . . 9.39 9.26 3H 2 _54 10.15 



100^00 100.00 532 100.00 



