Researches on the Salts of Selenious Acid. 



49 



3. 8 / 5 -Selenite: 5Be.0 2 .SeO + 3H 2 .0 2 .SeO + 2H 2 0. 



The basic salt, when treated with a quantity of anhydride of sele- 

 nious acid amounting to 168.2 pr. cent of its own weight, gave a solution, 

 which, on slowly evaporating at 60° in a vessel, covered with a watch-glass, 

 afforded a salt in microscopic crystals of complicated form and completely 

 homogeneous. Extremely difficult to be dissolved, both in warm and cold 

 water, it is pretty easily soluble, on heating, in water containing hydro- 

 chloric acid. 



Analyses: 



1) 0.4995 gr. salt gave 0.2845 gr. selenium or 0.3997 gr. selenious acid 

 and 0.056 gr. glucina. 



2) 0.421 gr. salt gave 0.24 gr. selenium or 0.3372 gr. selenious acid and 

 0.0475 gr. glucina. 



Calculated on 100 parts: 



fonnd calculated 



1. 2. 



Glucina 11.21 11.28 5BeO 126 11.41 



Selenious acid . . 80.04 80.10 8Se0 2 888 80.43 



Water (loss). . . . 8.75 __8.62 5H a O _90 8.16 



lOCUX) lOOToO 1104 100.00 



The mother-liquor from this salt was allowed under the same cir- 

 cumstances once more to deposit crystals. Then was obtained 



4. Va -Selenite : 3Be.0 2 .SeO + 4H 2 .0 2 .SeO + H 2 0, 



deposited in microscopic, very well developed twin-crystals, in all probability 

 formed by acute, quadratic double pyramids with strongly developed basal 

 end-faces and one pyramid-face as twin-face. To water and muriatic acid 

 it showed the same behaviour as the preceding salt. 



Analysis: 



0.4167 gr. salt gave 0.2436 gr. selenium or 0.3423 gr. selenious acid and 

 0.0346 gr. glucina. 



Nova Acta Reg. Soc. Sc. Ups. Ser. HI. 7 



