484. H. D. Minnig — Aluminium and Beryllium. 



hydroxide added to alkaline reaction. The precipitate was 

 allowed to settle, filtered, and treated as usual in determina- 

 tions where beryllium is weighed as the oxide. Results of the 

 experiments are given below. 



Separation by One Precipitation. 



A1 2 3 A1 2 3 A1 2 3 BeO BeO BeO 



Taken as A1C1 3 Found Error Taken as BeCl 3 Found Error 



grin. gi'Hi. grm. S lrn - grm. grrn> 



0-0927 0-0933 +0-0006 0-0638 



0-0927 0-0934 +0-0007 0-0638 



00927 0-0943 +0-0016 0-0638 



0-0927 0-0934 +0-0007 0'0638 



0-0927 0-0931 +0-0004 0-0638 



0-0865 0-0878 +0-0013 0'0561 0-0549 —00012 



High results in the foregoing table seemed to indicate that 

 beryllium chloride was being included in the aluminium precipi- 

 tate, a circumstance which does not seem surprising in view of 

 the marked similarity between the reactions of the two 

 elements. A double precipitation of the aluminium was there- 

 fore tried. After the first precipitation the liquid was de- 

 canted through the filter, retaining as much as possible of the 

 precipitate in the beaker. This precipitate in the beaker was 

 washed four or five times with the precipitating mixture 

 and finally dissolved in a small quantity of water. The excess 

 of water was evaporated off and the process of precipitation 

 repeated. The two filtrates were united and the beryllium 

 determined as before. 



Separation by Two Precipitations. 



A1 2 3 A1 2 3 A1 2 3 BeO BeO BeO 



Taken as A1C1 3 Found Error Taken as BeCl 3 Found Error 



grm. grm. grm. grm. grm. grin- 



0-0865 



0-0869 



+ 0-0004 



0-0561 







0-0865 



0-0868 



+ 0-0003 



0-0561 







0-0865 







0-0561 



0-0564 



+ 0-0003 



0-0865 



0-0867 



+ 0-0002 



0-0561 



0-0575 



+ 0-0014 



0-0865 



0-0867 



+ 0-0002 



0-0561 



00561 



0-0000 



0-0865 



0-0865 



o-oooo 



0-0561 



0-0560 



—o-oooi 



0-0865 



0-0870 



+ 0-0005 



0-0561 



0-0554 



— 0-0007 



0-0865 



0-0866 



+ 0-0001 



0-0561 



0-0557 



— 0-0004 



0-0865 



0-0881 



+ 0-0016 



0-1122 



0-1111 



—o-ooii 



0-0865 



0-0884 



+ 0-0019 



0-1122 



0-1093 



— 0-0029 



0-0865 



0-0869 



+ 0-0004 



0-1122 



0-1118 



— 0-0004 



0-0865 



0-0S73 



+ 0-0008 



0-1122 



0-1108 



— 0-0014 



0-1730 



0-1739 



+ 0-0009 



0-0561 



0-0548 



— 0-0013 



0-1730 



0-1741 



+ 0-0011 



0-0561 



0-0554 



— 0-0007 



