Associated with Calcium and Magnesium. 



215 







Table I. 













The Estimatio 



n of Barium. 















Amount of mixture and 



BaCl 2 



taken as 



BaCl 2 .2H 2 



Bad, 

 found 





Water to 



dissolve 



BaOU.SHjO 



com] 



position by volume 



Error 



To precipitate To wash 



grm. 



grm. 



grm. 











1-0-0859 



0-0859 



—o-oooof 



lcrni 



5 cm3 



2:1 



10 cm3 2:1 



2-0-0861 



0-0854 



— 0-0007f 



it 



5 e,n« 



2:1 



10 cra3 2;l 



3-0-0861 



0-0858 



— 0-0003f 



« 



ccm3 



2:1 



10 cm3 2:1 



4-0-0862 



0-0854 



— 0-0008* 



u 



gcm3 



2:1 



1() cm3 2;1 



5-0-0857 



0-0854 



— 0-0003* 



a 



gems 



2:1 



1() cm3 2;1 



6-0-0858 



0-0860 



+ 0-0002* 



u 



gem' 



2:1 



30 cmS 4:1 



7-0-0860 



0-0859 



—o-oooi* 



(< 



gems 



2:1 



30 cm3 4:1 



8-0-0853 



0-0850 



— 0-0003* 



tc 



gcm3 



2:1 



acetone 



9-0-0854 



0-0848 



— 0-0006* 



c< 



gems 



2:1 



(i 



10-0-0852 



0-0851 



— 0-0001* 



a 



gem' 



2:1 



(t 



11-0-0857 



0-0856 



— o-oooif 



u 



gem 3 



2:1 



u 



12-0-0852 



0-0845 



— o-oooYf 



c< 



gem 3 



2:1 



(( 



13-0-0855 



0-0852 



— 0-0003f 



u 



gem 3 



2:1 



LI. 



14-0-0862 



0-0862 



—o-oooof 



a 



30 cmS 



4:1 



a 



15-0-0868 



0-0868 



— o-oooo} 



a 



30 cm3 



4:1 



a 



*Ig: 



aited at low redness. 



f Dried at 135° forl^ 



hrs. 



acetone and acetyl chloride is added at tlie rate of five drops 

 in the second to the solution containing no more than 05 grm. 

 of the calcium and magnesium salts, barium chloride is pre- 

 cipitated and calcium chloride and magnesium chloride are 

 dissolved ; but when the soluble chloride is present in the pro- 

 portion of 1*0 grm. to - l grm. of the barium chloride, the 

 rate of addition of the precipitating mixture should not be 

 greater than two drops in the second at the start in order to 

 avoid inclusion of the soluble salt in the insoluble barium salt. 

 Even in such cases the mixture may be added at the rate of 

 five drops in the second, after the greater part of the barium 

 is down. Tables II and III contain the data of experiments 

 upon the separation of barium from calcium and magnesium. 

 The results obtained in the separation of - l grm. of the 

 barium salt from 0-5 grm. of calcium and magnesium salts are 

 excellent. 



The separation of barium from strontium proves not to be so 

 simple. When the 4:1 mixture of acetone and acetyl chloride 

 is added to the concentrated water solution of 0*1 grm. of 

 strontium chloride a partial precipitation takes place. When 

 the precipitate thus produced was filtered off, washed with ace- 

 tone and with ether, and dried in air, it lost water amounting 

 to 19*93 per cent and 20-00 per cent of its weight on heating 



