Researches on the Salts of Selenious Acid. 



97 



Analysis: 



0.7043 gr. salt gave 0.3042 gr. selenium or 0.4274 gr. selenious acid and 

 0.3457 gr. sulphate of lanthanum, containing 0.1991 gr. oxide of lan- 

 thanum. 



In 100 parts: 



Oxide of lanthanum ... 28.27 La 2 3 326 29.16 



Selenious acid 60.68 6Se0 2 666 59.57 



Water (loss) _H j05 7H 2 ^26 J- 1^27 



100.00 1118 IOoToO 



A before-mentioned salt of aluminium, 



Al 2 .0 G .3SeO + 3H 2 .0 2 .SeO 4- 2H 2 0, 

 agrees with this diselenite, but holds only 2 mol. water of crystallization, 

 quite in accordance with the following 



5. Diselenite: La 2 .0 6 .3SeO + 3H 2 .0 2 .SeO + 2H 2 0, 



which was obtained by treating hydrate of lanthanum with selenious acid. 

 The carbonic acid which the hydrate had taken up in contact with the air 

 being expelled, there was formed a heavy powder, crystalline when viewed 

 with the microscope; by the evaporation of the mother-liquor it was obtained 

 crystallized in distinct, oblique, four-sided laminse. 



Analyses: 



1) 0.57 gr- salt gave 0.2403 gr. selenium or 0.3376 gr. selenious acid 

 and 0.3075 gr. sulphate of lanthanum, containing 0.1771 gr. oxide of 

 lanthanum. 



2) 0.6615 gr. salt gave 0.279 gr. selenium or 0.392 gr. selenious acid 

 and 0.359 gr. sulphate of lanthanum, containing 0.2068 gr. oxide of 

 lanthanum. 



In 100 parts: 



Oxide of lanthanum . 

 Selenious acid . . . . 

 Water (loss) 



Nova Acta Reg. Soc. Sc. Ups. 



found 

 1. 2. 

 . . . 31.07 31.26 

 . . . 59.24 59.26 

 . . . 9.69 9.48 



100.00 100.00 

 Ser. HI. 



calcul ated 



La 2 3 326 30.13 

 6Se0 2 666 61.55 

 5H 2 _90 8.32 



1082 100.00 

 13 



