Researches on the Salts of Selenious Acid. 



31 



As the mother-liquor afterwards separated diselenite with its peculiar 

 crystalline form, it is evident that there exists no triselenite of sodium, nor, 

 consequently, of the other alkaline metals. 



SELENITES OF LITHIUM. 



To the best of ray information, no compounds of this metal with 

 selenious acid have been hitherto examined. They exhibit a composition 

 analogous to that of the other alkaline metals and have also been obtained 

 in a similar manner. 



1. Neutral: Li 2 .0 2 .SeO + H 2 0. 



A solution containing this salt, when allowed to evaporate at the 

 ordinary temperature, hardly yields distinct crystals, but readily, a white, 

 butter-like mass. If, on the contrary, the evaporation takes place at a higher 

 temperature, a salt is obtained in microscopical, white, satiny, extremely fine 

 needles which are very slowly dissolved in cold, more easily in warm wa- 

 ter. In all probability, there exists a salt, containing more water and being, 

 both in cold and in warmth, much more soluble than this, which, just on 

 account of its being less soluble, is deposited on heating the solution. 



Analyses: 



1) 0.4963 gr. salt gave 0.2467 gr. selenium or 0.3466 gr. selenious acid, 

 and 0.3473 gr. sulphate of lithium or 0.0947 gr. lithia. 



2) 0.4919 gr. salt gave 0.2436 gr. selenium or 0.3423 gr. selenious acid, 

 and 0.347 gr. sulphate of lithium or 0.0946 gr. lithia. 



3) 0.184 gr. salt, when kept over sulphuric acid, did not diminish in the 

 weight, but lost 0.01 gr. at 100°. 



Calculated on 100 parts: 



experiment theory 



1. 2. 3. 



Lithia 19.08 19.23 — Li 2 30 18.87 



Selenious acid . . 69.82 69.58 — ScO 2 111 69.81 



Water (loss). . . . 11.10 11.19 5.44 H 2 _18 11.32 



100.00 100.00 1~59 100.00 



