100 



L. F. Nilson, 



SELENITES OF INDIUM. 



1. 3 /4-Seleilite: In 8 .0 21 .9 > Se04-25H 2 = 3(In 2 .0 6 .3SeO)+In 2 .0 6 .H 6 +22H 2 0. 



On adding selenite of sodium in excess to neutral chloride of in- 

 dium, an amorphous, slimy, insoluble salt was precipitated. 



An aly ses: 



1) 0.419 gr. salt gave 0.1205 gr. selenium or 0.1693 gr. selenious acid 

 and 0.176 gr. oxide of indium 



2) 0.4615 gr. salt gave 0.1305 gr. selenium or 0.1834 gr. selenious acid 

 and 0.194 gr. oxide of indium. 



3) 1.3395 gr. salt lost 0.18 gr. of its weight at 100°. 



Represented in 100 parts: 



found calculated 



1. 2. 3. 



Oxide of indium . 42.00 42.04 — 4In 2 3 1099.2 43.13 



Selenious acid . . 40.41 39.74 — 9Se0 2 999.0 39.21 



Water (loss) . . . 17.59 18.22 13.44 25H 2 4 50. 17.66 



100.00 100.00 2548.2 100.00 



This salt is analogous to the selenites of chromium and aluminium, 

 formed under the same circumstances. It parts at 100° with 19 mol. wa- 

 ter (calc. 13.41 pr. ct.). 



2. Neutral: In 2 .O 6 .3SeO + 0H 2 O. 



Neutral selenite of indium was obtained, when 1 mol. of the fore- 

 going salt was digested with 3 (anal. 1 — 3) or 15 (anal. 4 — 5) or 39 

 (anal. 6 — 7) mol. selenious anhydride and some water at a temperature of 

 about 60°, the mixture not being allowed completely to evaporate; if, on 

 the contrary, it was wholly dried and subsequently treated with water, the 

 acid salts, mentioned below, were obtained. In neither case, did even 

 traces of indium occur in the solution. 



The neutral salt, subjected to the microscope, exhibited a pretty 

 developed crystallization of fine acicular prisms, which, no excess of sele- 

 nious acid being present, were for the most part united in globular 

 aggregates. 



