310 GoocK and Danner — Interaction of Potassium, etc. 









Table V. 









TeOo taken. 



A. 



Te0 2 found. 



Error. 





Mean error. 



(1) 



0-1200 gnu. 



0-1199 



grin. 



0-0001 grm 



•-] 





(2) 



0-0783 " 



0-0783 



a 



o-oooo " 



1 





(3) 



0-0931 " 



0-093*8 



a 



0-0007 " 



X\ 



0-0006 gri 



(*) 



0-1 100 " 



0-1116 



. u 



0-0016 " 



(5) 



0-0904 " 



0-0907 



EC 



0-0003 " 



+ 1 





(6) 



0-1065 " 



0-1077 



(C 



0-0012 " 



+ J 







Te0 2 taken. 



B. 

 TeOa found. 



Error. 





Mean error. 



(1) 



0-0910 grm. 



0-0912 



grm. 



0-0002 grm 



+ 1 





(2) 



0-0910 " " 



0-0908 



a 



0-0002 " 



— | 





(3) 

 (4) 



0-0911 '• 

 0-0913 " 



0-0922 

 0-0913 





o-oon " 



0-0000 " 



i 



0-0003 gri 



(5) 



0-0912 " 



0-0913 



a 



o-oooi " 



+ 1 





(6) 



0-0914 " 



0-0921 



a 



0-0007 " 



+ J 





Tlie agreement between the indications of the two methods 

 is evidently close, and it is suggestive that that error which is 

 slightly the larger, and also in the direction indicative of larger 

 expenditure of the permanganate in producing the effect 

 sought, is found on the side of the determinations made in 

 alkaline solution. 



As to the correlative question of the liberation of oxygen 

 during oxidations by potassium permanganate in alkaline solu- 

 tion we have made no experiments, but experience (not de- 

 tailed in this paper) in the collection of the gas liberated in 

 oxidations effected in presence of acid leads us to distrust the 

 evidence of such experiments unless the amount of gas libe- 

 rated is considerable. While, on the one hand, small quanti- 

 ties of liberated gas may be so completely absorbed as not to 

 appear free at all it often transpires, on the other hand, that 

 the simple admixture of unlike liquids — such, for example, as 

 a solution of potassium permanganate with sulphuric of 

 strength insufficient to liberate oxygen — may bring about a 

 very appreciable liberation of dissolved gases. So far as ap- 

 pears, however, the affirmation of the liberation of oxygen in 

 oxidations by potassium permanganate in alkaline solutions 

 now rests upon evidence of that nature only. 



