Researches on the Salts of Selenious Acid. 



85 



Analyses: 



1) 0.644 gr. salt gave 0.2286 gr. selenium or 0.3212 gr. selenious acid and 

 0.1625 gr. oxide of iron. 



2) 0.77 gr. salt gave 0.275 gr. selenium or 0.3864 gr. selenious acid and 

 0.1955 gr. oxide of iron. 



3) 0.6517 gr. salt, when heated to 100°, lost 0.1236 gr. water. 



Represented in 100 parts: 



experiment theory 



1. 2. 3. 



Oxide of iron .... 25.23 25.39 — Fe 2 3 160 24.43 

 Selenious acid. ... 49.88 50.18 — 3Se0 2 333 50.84 



Water (loss) 24.89 24.43 18.96 9H 2 JL62 24.73 



100.00 100.00 655 100.00 



At 100° the salt loses 7 mol. of water out of 9 (calc. 19.25). 



3. Neutral: Fe 2 .0 6 .3SeO + 7H 2 0. 



The basic salt, mentioned under I, was acted upon with the quan- 

 tity of selenious anhydride necessary for forming a neutral salt or 5 . 93 pr. ct. 

 Its appearance and properties did not by this treatment undergo any change 

 that could be observed. 



Analyses: 



1) 0.5805 gr. salt gave 0.2193 gr selenium or 0.3081 gr. selenious acid 

 and 0.1515 gr. oxide of iron. 



2) 601 gr. salt gave 0.2289 gr. selenium or 0.3216 gr. selenious acid 

 and 0.156 gr. oxide of iron. 



3) 0.3815 gr. salt, when dried at 100°, gave off 0.054 gr. water. 



Represented in 100 parts: 



experiment theory 



1. 2. 3. 



Oxide of iron .... 26.09 25.95 — Fe 2 3 160 25.85 



Selenious acid. . . . 53.08 53.51 — 3Se0 2 333 53.80 



Water (loss) 2 0.83 20.5 4 14.15 7H 2 J126 20.35 



100.00 100.00 619 100.00 



