26 



Borax at a white heat easily dissolves the oxide of samarium 

 and gives a topas-coloured glass, from which, when completely saturated 

 with the oxide, and after heating to a red heat, very thin micaceous, 

 brillant microscopic scales separate. After cooling, the glass was redu- 

 ced to a coarse powder and treated with dilute hydrochloric acid, which 

 left the borate as a chalk-like powder. The borate is readely soluble 

 in hydrochloric acid, especially on heating, so that the isolation of the 

 borate from the excess of borax-glass requires very careful treatement. 



0.9137 gram was dissolved in hydrochloric acid, the solution re- 

 peatedly evaporated and finally mixed with oxalic acid. After igniting 

 the oxalate 0.7602 gram SmsOj was obtained. 



1.8695 gram gave 1.5557 gram SmsOj. 



In percent: 



Calc 



Sm^Oa 83.20 83.21 174 83.25 



B^Os (16.80) (16.79) 35 16.75 



100.00 100.00 209 100.00 

 Spec. Grav: 



\ 



1.4490 gram, t" 16^4, sp. Gr. 6.045 

 1.4226 » » » » » 6.052 



Mean of both determinations: 6.048. 

 Molecular volume: 34.6. 



Sum of the molec. vol. of SmaOs and B2O3, divided with 2 = 40.0. 



