Researches on the Salts of Selenious Acid. 



99 



Analysis: 



0.4435 gr. salt gave 0.147 gr. selenium or 0.2066 gr. selenious acid and 

 0.269 gr. sulphate of didymium, containing 0.1581 gr. oxide of di- 

 dymium. 



Centesimally represented : 



found calculated 



Oxide of didymium. ... 35.65 Di 2 3 342 30.08 



Selenious acid 46.59 4SeO 444 46.83 



Water (loss) 1 7 . 76 9 IPO Jj62 17.09 



100.00 948 100.00 



Cleve 1 ), by adding selenious acid and alcohol to the nitrate, obtained 

 even such an acid salt, but with only 4 mol. water. 



3. Sesquiselenite : 2[Di 2 .0 G .3SeO] + 3H 2 .0 2 .SeO + 18H 2 0. 



A solution, obtained by digesting the basic seleuite of didymium, 

 mentioned under 1, at a gentle heat in 128.5 pr. ct. its weight of selenious 

 anhydride and water, when allowed to evaporate to dryness and treated 

 with water, afforded this salt as a slightly lilac crystal-powder. Subjected 

 to the microscope it exhibited four-sided prisms. 



Analysis: 



0.495 gr. salt gave 0.1787 gr. selenium or 0.2511 gr. selenious acid and 

 0.2832 gr. sulphate of didymium, containing 0.1664 gr. oxide of di- 

 dymium. 



In 100 parts: 



found calculated 



Oxide of didymium ... 33.62 2Di 2 3 684 34.08 



Selenious acid 50.73 9Se0 2 999 49.77 



Water (loss) 15.65 18H 2 324 16.15 



100.00 2007 100.00 



That didymium has given this sesquiselenite, corresponding to the 

 above mentioned aluminium-salt 



2Al 2 .O fi .3eO + 3H 2 .0 2 .SeO + 12LTO, 

 seems in a theoretical point of view to be of great importance. 



») Bih. t. Sv. Vet. Akad:s handl. II N:o 8 s. 69. 



