Researches on the Salts of Selenious Acid. 



113 



Analyses: 



1) 0.5385 gr. salt gave 0.129 gr. selenium or 0.1813 gr. selenious acid 

 and, when the filtrate had evaporated and the sulphate been heated to 

 whiteness with carbonate of ammonium, 2325 oxide of thorium. 



2) 0.6317 gr. salt gave 0.1547 gr. selenium or 0.2174 gr. selenious acid 

 and 0.2767 gr. oxide of thorium. 



In 100 parts: 



found calculated 



1. 2. 



Oxide of thorium . . 43.17 43.80 ThO 2 266 42.09 



Selenious acid. . . . 33.67 34.41 2Se0 2 222 35.12 



Water (loss) 23.16 21.79 8H 2 144 22.79 



100.00 100.00 632 100.00 



2. y 4 -Selenite : 2(Th.0 4 .2SeO) + 3H 2 .0 2 .SeO + 1 3H 2 0. 



When the preceding salt, at a moderate heat, was digested in an 

 aqueous solution of 35.12 pr. ct. anhydride of selenious acid, the solution, 

 after evaporation to dryness and treatment of the residue with water, yielded 

 an insoluble compound, analogous in appearance to the neutral salt. 



Analyses: 



1) 0.5735 gr. salt gave 0.1965 gr. selenium or 0.2761 gr. selenious acid 

 and 0.189 gr. oxide of thorium, after heating to whiteness with car- 

 bonate of ammonium. 



2) O.5415 gr. salt gave 0.1835 gr. selenium or 0.2578 gr. selenious acid 

 and 0.1767 gr. oxide of thorium. 



In 100 parts: 



found calculated 

 1. 2. 



Oxide of thorium 32.96 32.63 2Th0 2 532 33.31 



Selenious acid 48.14 47.61 7Se0 2 777 48.65 



Water (loss) J^.90 19.76 16H 2 288 18.04 



100.00 100.00 1597 100.00 



Nova Acta Reg. Soc. Sc. Ups. Ser. HI. 15 



