Samarium. 25 



Carbonate of samarium and ammonium 



Sm,NH,,2C03+2H,0. 



The voluminous and amorphous precipitate which carbonate of 

 ammonium gives with the nitrate of samarium changes after some time 

 into a heavy powder consisting of small rounded granules, provided it 

 be left at the ordinary temperature in presence of an excess of carbo- 

 nate of ammonium. Only a trace of samarium remains in the solution. 

 Heated to 100" the salt loses water and ammonia. The compound 

 was pressed between filter-paper and analysed. 



0.8269 gram was dissolved in hydrochloric acid and precipitated 

 with tetrachloride of platinum, when 0.6224 gram (NH )2PtCl6 was obtai- 

 ned. From the filtrate the platinum was precipitated with HaS, and 

 0.4368 gram SmaOs obtained as oxalate. 



In percent: 



Calc 



Sm^Oj 52.82 348 53.70 



(NH^sO 8.81 52 8.02 



COa — 176 — 



HsO — 72 — 



648 



Carbonate of samarium and sodium 



Sm,Na,2C03 + 8H,0. 



The nitrate of samarium gives with an excess of carbonate of 

 sodium a voluminous and amorphous precipitate, which soon changes 

 into a yellowish white powder consisting of microscopic crystalline ag- 

 gregates. Only small traces of samarium remain in the solution. The 

 salt was pressed between filter-paper and analysed. Heated in air-bath 

 to 100" the compound loses 6 mol. HgO (found 24.54 and 24.69; calcu- 

 lated 24.71 percent). 



0.4360 gram gave 0.1751 gram Sm^Os and 0.0651 gram NaCl. 



Nova Acta Reg. Soc. Sc. Ups. Ser. III. 4 



