Samarium. 15 



Nitrate of samarium 



SmSNOs + eH^O. 



The coucentrated solution deposits, when slowly evaporated over 

 oil of vitriol, topas-yellow well developed crystals, but often solidifies 

 to a mass of flat needles. On heating the salt fuses easily, emits red 

 vapours and leaves a voluminous and porous mass of oxide. 



1.0969 gram gave 0.4274 gram SnigO; 

 0.7211 gram gave 0.2841 gram SniaO 



3- 



In percent: ^ , 



^ C a 1 c 



Sm^Os 38.96 39.40 174 39.19 



N^O-, - — 162 — 



HgO — — 108 — 



444 



Spec. Grav : 



1.3792 gram, f^ 20".4 sp. Gr. 2.370 

 1.6196 » » » y> » 2.380 



Mean of both determinations: 2.375. 

 Molecular volume: 186.9. 



lodate of samarium 



Sm3I03 + 6H2O (dried at 100" 2H2O). 



A solution of iodic acid added to a solution of a salt of sama- 

 rium (the acetate) produces a voluminous, amorphous, and whitish preci- 

 pitate. Dried between paper the salt lost at 100" 9.27 percent or 4 mol. 

 H2O (cale 9.19). 



I. 0.4555 gram iodate, dried at 100°, treated with a solution of 

 sulphurous acid and precipitated with nitrate of silver, gave 0.4538 gram 

 Agi. From the filtrate O.1171 gram SmaOg was obtained. 



II. 0.4983 gram gave 0.4981 gram Agi and 0.1254 gram Sm^Og. 



