Researches on the Salts of Selenious Acid. 



103 



Under the same circumstances as the above diselenite has been 

 formed, aluminium, cerium and lanthanum gave salts of an analogous 

 composition. 



In its selenites, indium then shows analogy to aluminium, chromium, 

 didymium, cerium and lanthanum, a circumstance which supports the 

 view, that the oxide of indium is a sesquioxide, advanced by Bunsen 1 ) 

 in his determination of the specific heat of the metal and confirmed by 

 Roessler's 2 ; production of indium-ammonium-alum. 



SELENITES OF URANIUM [URANYL] 

 1. Neutral: [Ur 2 2 ].0 2 .SeO + 2H 2 0. 



A solution of acetate of uranium treated with selenite of sodium in 

 excess, afforded a slimy, amorphous, yellow precipitate, insoluble in water, 

 but readily dissolved in hydrochloric acid. 



Analyses: 



1) 1.0662 gr. salt parted at 100° with 0.099 gr. water and gave 0.1885 

 gr. selenium or 0.2648 gr. selenious acid, and from the filtrate, after 

 evaporation and strong heating first in contact with the air, subsequently 

 in hydrogen, 0.6545 gr. uranous oxide or 0.6933 gr. uranic oxide. 



2) 0.672 gr. salt gave in the same manner 0.1163 gr. selenium or 0.1634 

 gr. selenious acid and 0.414 gr. uranous oxide, corresponding to 0.4384 

 gr. uranic oxide. 



In 100 parts: 



found calculated 



1. 2. 



Uranic oxide 65.02 65.24 IPO 3 285.6 66.02 



Selenious acid 24.84 24.32 SeO 2 111.0 25.66 



Water (loss) 10.14 10.44 3H 2 36.0 8.32 



100.00 100.00 432.6 100.00 



This salt gives off the water of crystallization at 100°. 



>) Ann. d. Ph. u. Ch. CXLI. 1. (1871;. 



2 ) Journ. f. prakt. Ch. [2] VII. S. 14. (1873). 



