Associated with Calcium and Magnesium. 



217 



"When a mixture richer in acetyl chloride, the 2:1 mixture of 

 aeetone-acetyl chloride, is added to the concentrated water solu- 

 tion of strontium chloride, the precipitate first formed is slowly 

 redissolved in a sufficient excess of the mixture and again 

 partially precipitated upon the addition of more acetone. This 

 second precipitate of SrCl 2 .2H a O is not completely soluble, 

 however, when the proportion of acetyl chloride is again 

 increased, but will dissolve upon the addition of an aeetone- 

 acetyl chloride mixture to which a few drops of water have 

 been previously added and which is, therefore, charged with 

 hydrogen chloride. So it appears that the solubility of the 

 strontium chloride, SrCl„.2H 2 0, depends to a very large extent 

 upon the concentration of hydrogen chloride in the mixture. 



In attempting the separation of barium from strontium, 

 therefore, it was the 2:1 mixture of acetone with acetyl choride 

 which, on account of its higher power as a solvent for 

 SrCl 2 .2H 2 0, was added to the concentrated water solution of 

 the barium chloride and strontium chloride, though .this mix- 

 ture has been shown to be somewhat less favorable to the com- 

 plete precipitation of barium chloride than the (4:1) mixture 

 containing the larger proportion of acetone, and the addition 

 was made at the rate not greater than two drops in the second 

 or 30 cm3 in ten minutes. The precipitate, filtered upon asbestos 

 and washed with acetone, was dried at 135°. The data of 

 these experiments are recorded in the table. 



The separation of barium from strontium by the process 







Table IV. 









The Separation of Barium from Str 



•ontium. 





BaCl 3 









Water used 



Amount ol 



taken as 



SrCl 2 



BaCl 2 





to dissolve 



mixture 



BaCl 2 .2H 2 



taken 



found 



Error 



salt 



(2:1) used 



grm. 



grm. 



grm. 



grm. 



cm 3 . 



cm 3 . 



1-0-0867 



0-0385 



0-0923 



+ 0-0056 



1 



30 



2-0-0866 



0-0304 



0-0857 



— 0-0009 



1 



30 



8-0*0860 



0-0320 



0-0861 



+ 0-0001 



1 



30 



4-0-0856 



0-0315 



00840 



— 0-0016 



1 



30 



5-0-0856 



0-0307 



0-0848 



— 0-0008 



1 



30 



6-0-0859 



0-0304 



0-0839 



— 0-0020 



1 



30 



7-0-0S62 



0-0307 



0-0859 



— 0-0003 



1 



30 



8-0-0857 



0-0315 



0-1160 



+ 0-0303 



0-5 



30 



9-0-0857 



0-0317 



0-1058 



+ 0-0201 



0-5 



30 



10-0-0853 



0-0315 



0-1083 



+ 0-0230 



0-5 



30 



11-00869 



0-0305 



0-1043 



+ 0-0174 



0-5 



30 



12-0-0863 



0-0307 



0-0906 



+ 0-0043 



0-5 



30 



13-0-0859 



00308 



0-0849 



—o-ooio 



0-5 



30 



14-0-0869 



0-0108 



0-0870 



+ 0-0001 



1 



30 



15-0-0865 



o-ouo 



0-0858 



— 0-0007 



1 



30 



16-0-0853 



0-0115 



0-0853 



±0-0000 



1 



30 



17-0-0861 



0-0109 



0-0870 



+ 0-0009 



1 



30 



