Samarium. 13 



0.8548 gram lost on heating to 100" 0.0460 gram. The dried sub- 

 stance was theia carefulh' ignited, and the residue dissolved in HCl. The 

 solution yielded with NH^ 0,4465 gram SmgOs + FeaO;; and the filtrate 

 0.H33 KCl. 



In percent : 



^ Calc 



The numbers found do not agree sufficienty well with those obtained by 

 calculation, so that there may be some doubt as to the exact amount 

 of water. 



Platinocyanate of samarium 



2Sm(CN)s + 3Pt(CN)2 + I8H2O. 



This compound was obtained by slowly evaporating, over oil of 

 vilriol, the solution resulting from the double decomposition of platino- 

 cyanide of barium and sulphate of samarium. The compound forms 

 beautiful tolerably large prisms which appear yellow by transmitted and 

 blue by reflected light. It is stable in the air, and looses at 110° 16.33 

 percent HjO or 14 mol. (= 16. 57). 



The analysis, already published'), gave in percent: 



Pt 38.69 38.46 



Pt + Sm23S04. . . 77.49 77.12 



Spec. Grav: 

 1.5721 gram, coarsely crushed crystals, t" 20°.s sp. Gr. 2.743 

 1.8872 » » » » » » » » 2.745 



Mean of both determinations : 2.744. 



Molecular volume : 554.3. 



Sulphocyanate of samarium 



Sm(CNS)3 + 6H2 0. 



A solution of the oxide in sulphocyanic acid was evaporated over 

 oil of vitriol. Slender, yellow, and highly deliquescent ueadles were de- 

 posited from the syrupy solution. The salt was pressed between filter- 

 paper as rapidly as possible and analysed. 



') Joinn. of the chein. soc. 1883, pag. 368. 



