Researches on the Salts of Selenious Acid. 



105 



Analyses: 



1) 0.56 gr. salt gave 0.142 gr. selenium or 0.1995 gr. selenious acid and 

 0.296 gr. uranous oxide, or 0.3135 gr. uranic oxide. 



2) 0.779 gr. salt gave 0.1965 gr. selenium or 0.2761 gr. selenious acid 

 and 0.41 gr. uranous oxide, corresponding to 0.4343 gr. uranic oxide. 



3) 0.5295 gr. salt at 100° lost 0.035 gr. water. 



Represented in 100 parts: 



experiment theory 



1. 2. 3. 



Uranic oxide ... . 55.98 55.76 - 3U 2 3 856.8 55.72 



Selenious acid ... 35.63 35.44 — 5Se0 2 555.0 36.09 



Water (loss) .... 8.39 8.80 6.61 7H 2 126. 8.19 



100.00 100.00 1537.8 100.00 



At 100° 6 mol. water of 7, contained in the salt, were expelled 

 (calc. 7.02). 



As the neutral selenite, even when treated, under the same circum- 

 stances, with 77 pr. ct. its weight of selenious anhydride, or precisely the 

 quantity necessary to convert it into a tetraselenite, only gave the last 

 mentioned salt, this seems to be the most acid selenite that can be formed 

 by it. The light-yellow, crystalline compound then obtained presented 

 namely the following values. 



Analyses: 



1) 0.7025 gr. salt gave 0.179 gr. selenium or 0.2515 gr. selenious acid; 

 the uranium-determination was lost. 



2) 0.548 gr. salt gave 0.14 gr. selenium or 0.1967 gr. selenious acid and 

 0.2855 gr. uranous oxide or 0.3024 gr. uranic oxide. 



3) 0.59 gr. salt lost 0.0365 gr. water at 100°. 



These values, calculated on 100 parts: 



Uranic oxide. . . — 55.18 — 

 Selenious acid . . 35.80 35.90 — 

 Water (loss). . . — 8.92 6.19 



100.00 



show the compound to be the same as the next-preceding. 



Nova Acta Reg. Soc. Sc. Ups. Ser. 1U. 14 



