Researches on the Salts of Selenious Acid. 



Ill 



truth of the conclusion regarding the quantivalence of the earth-metals in 

 question, drown from the above stated, striking analogy between all the 

 selenites of the latter metals and the sexivalent metals mentioned. Besides 

 it is worth notice that the selenite of bismuth retains its amount of water 

 at 100°, whilst the corresponding salts of erbium and yttrium [which should 

 be the most analogous, as also these metals have not given more acid 

 salts] according to Hoglund and Cleve, part with all their water or 4 mol. 



SELENITES OF ANTIMONY. 



1. 2 / 3 -Selenite: 2(Sb 2 .0 5 .2SeO)-|-H 2 0. 



Oxide of antimony, prepared by precipitating tartar-emetic with am- 

 monia under warmth, when treated with a concentrated solution of selenious 

 acid, yielded a white, brilliant salt which, on microscopical examination, 

 proved to be crystallized in very well developed, oblique, four-sided tablets. 



Analyses : 



1) 0.7 gr. salt, fumed with nitric acid and heated, gave 0.412 gr. tetroxide 

 of antimony or 0.3906 gr. trioxide. 



2) 0.6235 gr. salt gave likewise 0.367 gr. tetroxid of antimony or 0.348 

 gr. trioxide. 



3) 0.557 gr. salt gave 0.166 gr. selenium or 0.2332 gr. selenious acid. 



4) 0.802 gr. salt gave 0.2435 gr. selenium or 0.3421 gr. selenious acid. 



5) 0.776 gr. salt lost 0.013 gr. water at 100°. 



Calculated on 1 00 parts : 



experiment theory 



1. 2. 3. 4. 5. 

 Oxide of antimony 55.80 55.82 — — — 2Sb 2 3 584 55.83 

 Selenious acid. . . — — 41.87 42.65 — 4Se0 2 444 42.45 



Water — — — — 1 . 68 H 2 _J8 1.72 



1046 100.00 



From this basic salt, which may also be regarded as an anhydrous 

 salt of antimonyl and at 100° parts with its water, I obtained 



