Barium, as the Oxalates. 



223 







Table VIL 







BaO, 





Volume 



Acid 







taken as 



Ammonium 



at 



present 



BaO 





Ba(N0 3 ) 2 . 



oxalate. 



precipitation. 



during 



found. 



Error. 



grm. 



grm. 



cm 3 . 



A 

 100 



titration. 



grm. 



grm. 



0'1165 



0-2 



HC1 



o-im 



+ 00012 



cc 



a 



cc 



cc 



o-mo 



+ 0-0005 



a 



cc 



. cc 



cc 



0-1164 



—o-oooi 



cc 



cc 



cc 



cc 



0-1151 



— 0-0014 



a 



cc 



cc 



cc 



0-1165 



o-oooo 



a 



cc 



cc 



cc 



0-1176 



+ 0-0011 



u 



cc 



cc 



cc 



0-1164 



—o-oooi 



0-2330 



0-4 



cc 



cc 



0-2319 



—o-ooii 



(4 



a 



cc 



cc 



0-2335 



+ 0-0005 



cc 



(C 



cc 



cc 



0-2342 



+ 0-0012 



BaO, 













taken as 













BaCl 2 . 













0-0942 



a 



cc 



cc 



0-0952 



+ 0-0010 



u 



u 



cc 



cc 



0-0939 



— 0-0003 



a 



a 



cc 



cc 



0-0941 



—o-oooi 



0-1884 



0-4 



cc 



cc 



0*1893 



+ 0-0009 



a 



a 



cc 



B 

 200 



cc 



0-1892 



+ 0-0008 



0-0942 



0-2 



H a SO, 



00858 



— 0-0086 



0-1884 



0-4 



cc 



cc 



0*1732 



— 0-0152 



0*0942 



0-2 



500 



cc 



0-0857 



— 0-0085 



In the experiments given in section B of Table VII, the 

 precipitate of barium oxalate was treated with sulphuric acid 

 after the addition of the stated amount of water. The results 

 show a large loss of oxalic acid probably due to the occlusion 

 of some of the oxalic acid by the barium sulphate. This fact 

 must prevent the use of sulphuric acid in an analytical process 

 which depends upon the liberation of oxalic acid from barium 

 oxalate. 



Gravimetric Estimation of the Oxalates of Strontium and 



Barium. 



It is well known that calcium may be weighed as the carbon- 

 ate after a careful ignition of the oxalate, and it would seem 

 probable that strontium might also be weighed as the carbonate. 

 Precipitates of strontium oxalate, on asbestos, were ignited in 

 a capped crucible from 2-8 minutes in the flame of a Bunsen 

 burner and weighed as the carbonate, and in a single case the 

 carbonate thus produced was converted by treatment with sul- 

 phuric acid to the sulphate and weighed as such. The results 

 are given in Table VIII, and, while they show slight losses, the 

 results are fairly accurate. 



Am. Jour. Sci. 

 16 



-Fourth Series, Yol. XII, No. 69.— September, ISO], 



