Researches on the Salts of Selenious Acid. 



107 



I have namely obtained: 



1:0. From dilute solutions of the neutral salt, by treatment 

 with neutral selenite of sodium: 



a. 3 / 4 -selenite: Al 8 .0 21 .9SeO + 36H 2 0. 



Cr 8 21 .9SeO+64H 2 0. 

 In 8 .0 21 .9SeO + 25H 2 0. 



b. % -selenite: Ce 4 .O u .5SeO + 30H 2 O. 



c. % -selenite: Fe 6 .0 17 .8SeO + 28H 2 0. 



La fi .0 17 .8SeO + 28H 2 0. 

 Di' ; .0 17 .8SeO + 28H 2 0. 



d. neutral selenite: Y 2 .0 6 .3SeO+ 12H 2 0. 



Er 2 .0 6 .3SeO + 5H 2 0. 

 Er 2 .0 6 .3SeO+9H 2 0. 



2;o. From the basic salt, by treating with the quantity of acid 

 necessary for forming neutral salt: 



neutral selenite: Al 2 .O fi .3SeO -f 7H 2 0. 



Cr 2 .0 G .3SeO + 15H 2 0. 

 Fe 2 .0 6 .3SeO + 7H 2 0. 

 Ce 2 .0 6 .3SeO + 12H 2 0. 

 In 2 . 6 .3SeO-]-6H 2 0. 



3:o. From the basic or the neutral salt, by treating with the 

 quantity of acid necessary for forming diselenite; 



4 / 3 -s e 1 e n i t e : Cr 2 .0 6 .3SeO + H 2 .0 2 .SeO + 1 2H 2 0. 



Fe 2 .0 G .3SeO + H 2 .0 2 .SeO 4- 9H 2 0. 

 Fe 2 .0 6 .3SeO -f H 2 .0 2 .SeO 4- 7H 2 0. 

 Ce 2 .0 6 .3SeO + H 2 .0 2 .SeO + 5H 2 0. 

 Di 2 .0 6 .3SeO+H 2 .0 2 .SeO + 8H 2 0. 2 ) 

 Y 2 .0 6 .3SeO + H 2 .0 2 .SeO + 3H 2 0. 

 Er 2 .0 6 .3SeO + H 2 .0 2 .SeO + 3H 2 0. 



Like yttrium and erbium, also iron has not given salts more acid 

 than those here mentioned. 



») Obtained by Jolin with 4 mol. H 2 0. 

 2 ) Obtained by Cleve with 3 mol. tPO. 



