Permanganate in the Presence of Ferric Chloride. 37 



Table III, in which we iind no variations in results whether 

 ferric chloride is present or not. The canse of the apparently 

 greater destruction of potassium permanganate in those experi- 

 ments of Table I in which ferric chloride was used than in those 

 in which ferric chloride was not used, is now under investiga- 

 tion. 



Table IV. 











Vol- 





Time 



Residual 













KMn0 4 





ume 



Tem- 



of 



KMn0 4 



CI 





KMn0 4 



^HCl 



W HC1 



before 



H^O 



during 



pera- 



diges- 



color 



test 



H2C2O4 



to 



diges- 





diges- 



ture. 



tion 



after 



after 





color. 



cm 3 . 



cm 3 . 



tion. 

 cm 3 . 





tion. 

 cm 3 . 



C°. 



min. 



diges- 

 tion. 



diges- 

 tion. 





cm 3 . 



KMn0 4 

 appar- 

 ently in- 

 duced 

 during 

 digestion. 

 m 3 . 



[ 40 cm3 N (H4N)2 C 2 4 



37 . 6 4cm3 KMn0 4 

 101-40 cm3 KMnO 4 | 



100 



9-90 



100 | .. 



210 



50 



60 



none 



faint 



100 



59-52 



100 



9-90 



100 ! ._ 



210 



" 



t. 



" 



" 



100 



58-44 



58-12 

 57-04 



[40cm3 N (H 4 N) 2 C 2 4 



= 18-35 cm3 KMn0 4 









50 cm 



5 



E a C a O-4 





- 49-26 cm3 KMn0 4 .] 









III 



100 



9 90 



50 



- 



160 



50 



60 



none 



none 



50 



30-72 



31-46 



IV 



100 



9-90 



50 





160 



< i 





< 



a 



" 



50 



30-75 



31-49 



V 



100 



9-90 



50 





160 



a 





i 



a 



" 



50 



30-76 



31-50 



VI 



100 



9-90 



50 





160 



a 





' 



«' 



a 



50 



30-78 



31-52 



VII 



100 



9-90 



50 





160 



ti 





1 



a 



" 



50 



30-88 



31-62 



vni 



100 



9-90 



50 



50 



210 



a 





i 



faint 



faint 



50 



27-11 



27-85 



IX 



100 



9-90 



50 



50 



210 



a 





1 



" 



i i 



50 



27-92 



28-66 



X 



100 



9-90 



50 



50 



210 



" 





< 



u 





50 



28-52 



29-26 



XI 



100 



9-90 



50 



50 



210 



" 





< 



it 





50 



28-54 



29-28 



XII 



100 



9-90 



50 



50 



210 



<< 





1 



a 



11 



50 



29-14 



29-88 



XIII 



100 



9-90 



50 



50 



210 



t< 





< 



a 



ii 



50 



28-98 



29-72 



XIV 



100 



9-90 



50 



50 



210 



a 





1 



a 



11 



50 



28-56 



29-30 



XV 



100 



9-90 



50 



50 



210 



" 



" 



a 



" 



50 



29-96 



30-70 



XVI 



100 



9-90 



50 



50 



210 



a 



85 



none 



very 

 faint 



50 



2996 



30*70 



XVII 



100 



9-90 



50 



50 



210 



< i 



60 



faint 



faint 



50 



30-22 



3096 



XVIII 



100 



9-90 



75 





185 



" 



" 



none 



marked 



50 



20-72 



46-46 



XIX 



100 



9-90 



50 



50 



210 



a 



120 



none 



none 



50 



30-31 



31-05 



XX 



100 



9-90 



100 





210 



a 



60 



marked 



marked 



60 



19-58 



60-47 



XXI 



100 



9-90 



75 



50 



235 



a 



220 



none 



faint 



50 



21-84 



47-58 



XXII 



100 



9-90 



100 



50 



260 



u 



180 



marked 



marked 



60 



10-18 



51-07 



2X 



HC1 



50 

 50 

 50 



9-90 

 9-90 

 9-90 



50 



75 



75 



._ 



110 



" 



60 



none 



faint 



_. 



135 



a 



60 



<< 



marked 



-- 



135 



a 



60 



" 



a 



50 

 50 



30-23 

 30 : 69 



30-97 

 56-43 



Since in all experiments thus far conducted the permanganate 

 color has been entirely destroyed, the experiments of Table IV 



