Samarium. 37 



In percent: 



Calc 



Sm203 25.17 174 25.33 



(C,H5S03),0 . . — 351 — 



HaO — 162 — 



687 

 Spec. Grav: 



0.7973 gram, large crystals, temp. 20''.8 sp. Gr. 1.874 



0.6180 » » » » » » » 1.885 



Mean of both determinations: 1.879. 

 Molecular volume: 365.6. 



Oxalate of samarium 



Sm23C2O4+10H2O. 



On adding a solution of oxalic acid to solutions of the salts of 

 samarium, bulky, white, and caseous precipitates are thrown down which 

 soon become heavy and crystalline. Oxalate of samarium is soluble in 

 concentrated nitric acid. At 110" it loses 6H2O. 



1.0029 gram gave by ignition 0.4638 gram SmsOj. 



In percent: 46.25 SmgOj; calc 46.77. 



Oxalate of samarium and potassium 



KSm2aO,-f2(V,?)H30. 



A solution of the nitrate of samarium gave with an excess of 

 neutral oxalate of potassium a white amorphous precipitate. Only a very 

 small quantity remained in the solution. The salt was simply pressed 

 between filter paper of then analysed. 



0.7401 gram lost 0.0721 gram HjO at 125" and at 190" an addi- 

 tional 0.0085 gram, or total 0.0806 gram H2O. From the same qvantity 

 0.3063 gram SmjOg and 0.1345 gram KCl were obtained. 



