Samarium. 29 



Cale 



In percent: 



Sms,03 44.97 '348" 



P2O5 36.47 284 



H2O 17.95 144 



99..39 776 



Anhydrometaphosphate of samarium 



If the anhydrous and finely powdered sulphate of samarium be 

 added to fused metaphosphoric acid, it dissolves easily, fumes of sul- 

 phuric acid being given of. The residue soon becomes white owing to 

 the formation of small crystals. After cooling, the mass was treated 

 with water which dissolved the phosphoric acid and left a heavy 

 yellowish-white powder of small glittering crystals, insoluble in water 

 and in boiling nitric acid. The crystals were very well developped« 

 They represent a new series of phosphates. Didymium gives an exactly 

 analogous phosphate. 



0.6425 gram was fused with soda and the fused mass treated with 

 water. The solution was precipitated with magnesia-mixture and the 

 residue dissolved in nitric acid and precipited with oxalic acid. By 

 igniting the oxalate 0.2150 gram Sm^Og was obtained. The filtrate from 

 the oxalate contained phosphoric acid, which was precipitated as am- 

 monium-magnesium-phosphate. Altogether 0.6678 gram MgsPgO, was 

 obtained 



0.9672 gram gave 0.3195 gram SmaOg and 1.0138 gram Mg^PaO,. 



99.94 100.07 529 100.00 

 Spec. Grav: 



1.0145 gram, temp. 28°.8, sp. Grav. 3.485 



0.9965 » » » » » 3.489 



Mean of both determinations: 3.487. 

 Molecular volume: 151.7. 



