Browning — Separation of Barium from Calcium. 315 



of the alcohol reached its normal boiling point the beaker was 

 removed and the barium nitrate filtered off upon an asbestos 

 felt in a perforated platinum crucible, the crucible and felt 

 having been previously dried and weighed. The filtration was 

 carried on under gentle pressure, the filtrate being received in 

 a beaker standing under a bell jar upon a ground glass plate. 

 The last traces of barium nitrate were removed from the 

 beaker by washing with small amounts of anhydrous amyl 

 alcohol contained in a wash bottle, previously described, to the 

 mouth piece of which a small chloride of calcium tube was 

 connected. The crucible containing the barium nitrate was 

 placed in an air bath and heated to 150° C. The process of 

 heating and weighing was repeated until a constant weight was 

 obtained. Series I shows the results of these experiments the 

 barium being calculated as oxide. 







Series I. 







BaO taken. 



BaO found. 



Error. 



(1) 



0-1040 grm. 



0-J039 grm. 



0-0001 grm. — 



(2) 



0-1043 " 



0-1043 " 



o-oooo " 



(3) 



0-0524 " 



0-0522 " 



0-0002 " — 



(4) 



0-0519 " 



0-0518 " 



o-oooi " — 



These results show plainly enough the complete insolubility 

 of the barium salt in the amyl alcohol ; but to confirm them 

 the filtrates of (3) and (4) were evaporated to dryness, ignited 

 to burn off any organic matter from the amyl alcohol, treated 

 with sulphuric acid, heated to low redness and weighed. The 

 weights in both cases showed the absence of any residue. 







Series 



II. 







BaO taken. 



BaO found. 



Error. 



CaO taken. 



CaO found. 



Error. 



grams. 



grams. 



grams. 



grams. 



grams. 



grams. 



(5) 0-1410 



0-1406 



0-0004 — 



0-0112 



0-0114 



0-0002 + 



(6) 0-1300 



0-1301 



o-oooi + 



0-0926 



0-0926 



o-oooo 



(7) 0-1043 



0-1049 



0-0006 + 



0-0741 



0-0736 



0-0005 — 



(8) 0-0781 



0-0781 



o-oooo 



0-0556 



0-0554 



0-0002 — 



(9) 0-0525 



0-0526 



o-oooi + 

 Series 



0-0373 

 III. 



0-0372 



o-oooi — 



BaO taken. 



BaO found. 



Error. 



CaO taken. 



CaO found. 



Error. 



grams. 



grams. 



grams. 



grams. 



grams. 



grams. 



(10) 0-1304 



0-1308 



0-0004 + 



0-0927 



0-0921 



0-0006 — 



(11) 0-1043 



0-1046 



0-0003 + 



0-0371 



0-0370 



o-oooi — 



(12) 0-1037 



0-1036 



o-oooi — 



0-0743 



0-0744 



o-oooi + 



(13) 0-0783 



0-0776 



0-0007 — 



0-0427 



0-0422 



0-0005 — 



(14) 0-0519 



0-0521 



0-0002 + 



0-0369 



0-0361 



0-0008 — 



(15) 0-0519 



0-0512 



0-0007 — 



0-0570 



0-0567 



0-0003 — 



(16) 0-0261 



0-0259 



0-0002 — 



0-0925 



0-0925 



o-oooo 



