18 P. T. Cleve, 



Spec. Grav. of the crystallised salt: 



1.2339 gram, small crystals, t" IS^.i sp. Gr. 2.674 

 1.2297 » » » » » » » 2.677 



Mean of both determinations: 2.675 

 Molecular volume: 161.5. 



Spec. Grav. of the anhydrous salt: 



1.4657 gram, t° 18° sp. Gr. 3.191 



Molecular volume: 112.8. The mol. volume of (NH^), SO4 = 74.56 



, (NHOsSO^+Sm.SSO, 

 (Pettersson) of Sm^SSO, 150.8 and ^ — '-^ ^ -= 112.7. 



Sulphate of samarium and sodium 



SmNa2S04+H,0(?). 



If the saturated solutions of the simple salts be mixed, very small 

 and indistinct crystals are deposited. The salt does not lose water at 

 100". The saturated solution of this salt in sulphate of sodium-solution 

 contains about 0.24 gram Sm^Oa in 100 c. c. The spec, gravity was 

 found to be 3.54. 



0.5481 gram lost on heating to incipient redness 0.0307 gram H2O 

 and gave 0.2416 gram SmjOg and O.1106 gram Na.jS04. 



0.5336 gram lost 0.0300 gram HjO and gave 0.6454 gram BaS04. 



In percent: 



Calo 



SmjO,, 44.08 — 174 45.43 



Na,0 8.81 — 31 8.09 



SO3 — 41.53 160 41.78 



H,0 5.60 5.62 18 4.70 



383 100.00 



Hyposulphate of samarium. 



The solution obtained by double decomposition from the sulphate 

 of samarium and the hyposulphate of barium yields on evaporation over 

 oil of vitriol a thick liquid, which deposits the hyposulphate in long 

 slender needles, which were not analysed, as they could uoth be per- 

 fectly freed from the thick mother-liquor. 



