Samarium. 17 



Spec. Grav. of the crystallised salt: 



1.3454 gram, small crystals, t" IS^.S sp. Gr. 2.928 

 1.2293 » » » » » » « 2.932 



Mean of both determinations: 2.930. 



Molecular volume: 249.6. 



Spec. Grav. of the anhydrous salt: 



1.3027 gram, t° 18''.3 sp. Gr. 3.898. 



Molecular volume: 150.8. 



Sulphate of samarium and potassium 



2Sm3 3S04 + 9K,S04 + SH^O. 



This double salt forms a white, sparingly soluble, heavy powder. 

 A saturated solution of this salt in sulphate of potash solution con- 

 tains about 0.05 gram SmgOg in 100 c.c. 



The analysis has already been published ^) and gave 



Cale 



Sm^Og 25.17 24.87 



K2O 31.00 30.31 



H2O 1.96 1.93 



Sulphate of samarium and ammonium 



SmNH^, 2SO4 + 4H2O. 



The mixed solutions of the simple salts give by spontaneous eva- 

 poration small pale-yellow crystals which are soluble with difficulty. 

 The salt loses 3 mois. H^O at 110". 



0.7168 gram left by strong calcination 0.2888 gram SmjOj. 

 0.5324 gram gave 0.2130 gram SmaOg. 

 2.402 gram lost by 220" 0.396 gram H^O. 



In percent: Calc 



SmjOs .... 40.29 40.01 — 174 40.28 



(NH0,O. ... — — -- 26 — 



SO, .... — — — 160 — 



H^O .... — — 16.49 72^ 16.67 



432 



') Journ. of the chein. Soc. 1883. pag. 368. 

 Nova Acta Reg. Soc. ?c. Ups. Ser. III. 



