Researches on the Salts of Selenious Acid. 



101 



Analyses: 



1) 0.5014 gT. salt gave 0.1655 gr. selenium or 0.2325 gr. selenious acid 

 and 0.191 gr. oxide of indium 1 ). 



2) 0.569 gr. salt gave 0.1865 gr. selenium or 0.262 gr. selenious acid 

 and 0.2145 gr. oxide of indium. 



3) 0.5945 gr. salt lost 0.07 gr. of its weight at 100°. 



4) 0.559 gr. salt gave 0.1885 gr. selenium or 0.2648 gr. selenious acid 

 and 0.2125 gr. oxide of indium. 



5) 0.719 gr. salt gave 0.242 gr. selenium or 0.34 gr. selenious acid 

 and 0.2685 gr. oxide of indium. 



6) 0.5065 gr. salt gave 0.1745 gr. selenium or 0.2452 gr. selenious acid 

 and 0.19 gr. oxide of indium. 



7) 0.5725 gr. salt gave 0.1965 gr. selenium or 0.2761 gr. selenious acid and 

 0.2135 gr. oxide of indium. 



Represented in 100 parts: 



1. 2. 3. 4 



Oxide of indium . 38.09 37.70 — 38.02 



Selenious acid . . 46.37 46.05 — 47.37 



37.34 

 47.29 



6. 

 37.51 

 48.41 



37.29 

 48.22 



Water (loss) . . . 15.54 16.25 11.77 14.61 15.37 14.08 14.49 



100.00 100.00 



100.00 100.00 100.00 100.00 



the formula requiring: 



ln 2 3 274.8 38.38 

 3Se0 2 333.0 46.52 

 6H 2 108^0 15.10 



715.8 100.00 



The salt parts at 100° with 4y a mol. of the crystallization-water 

 (calc. 11 32 pr. ct.) 



3. Sesquiselenite: 2[In 2 .O fi .3SeO] + 3H 2 .0 2 .SeO + 12H 2 0. 



A mixture of the basic salt and 15 mol. or 65.35 pr. ct. selenious 

 anhydride, having evaporated to dryness at about 60°, afforded, after washing 

 with water, a granularly crystalline salt of this composition, completely 

 insoluble in water. 



') The quantity of indium-oxide was determined by evaporating the filtrate from 

 the separated selenium to dryness, fuming the excess of formed sulphuric acid and 

 heating the thus formed sulphate of indium, which, even in the flame of an ordinary 

 burner, speedely loses its sulphuric acid, so that the loss of weight, on further 

 heating to whiteness, is very inconsiderable. 



