Goocli & Scott — Determination of Vanadic Acid. 431 



Table II. 



Reduction of Vanadic Acid with the Aid of the Silver Anode in 

 the Electrolytic Cell. 



v,0 5 



taken as 



ammonium 



vanadate 



grin. 



0-0780 

 0-0786 

 00790 

 00783 

 00780 

 00781 

 00779 

 0-0779 

 0-0781 

 0-0785 



0-0773 

 0-0781 

 0-0784 

 0-0786 

 00781 

 0-0785 

 0-0778 

 0-0786 

 00773 

 0-0786 

 00776 

 0-0773 



v 2 5 



found bv 

 KMnOl 



(corrected) 

 srm. 



•0211 

 •0639 

 •0750 

 •0741 

 •0757 

 •0768 

 •0774 

 •0783 

 •0781 

 •0781 



•0770 

 ■0776 

 •0785 

 •0783 

 •0781 

 •0787 

 •0778 

 •0786 

 •0774 

 •0781 

 •0777 

 •0770 



Revolutions 



Period of anode: Strength 



of approximate of 



Error reduction number per current 



grm. min. minute amp. 



A. 



—0569 

 —0147 

 —0040 

 —0042 

 —0023 



— 0013 



— 0005 

 + ■0004 



•0000 

 —0004 



B. 



—0003 



—0005 



+ 0001 



—0003 



•0000 



+•0002 



•0000 



•0000 



+ 0001 



— 0005 

 + 0001 

 —0003 



5* 

 5* 

 5* 

 5* 

 5* 

 5* 

 5* 

 5* 

 5* 

 5* 

 5* 



700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 



700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 

 700-900 



"Approximate: to appearance of distinct cloudiness. 



These results were sufficient to show that the reduction 

 proceeds more rapidly at the higher temperature and to 

 serve as a guide in the following experiments in which 

 over-reduction of vanadic acid was corrected by the addi- 

 tion of silver sulphate, as in the procedure of Gooch and 

 Gilbert,^ boiling of the solution, and filtration from the 

 precipitated silver. The correction to be applied in the 

 permanganate titration (determined by experiments in 

 blank) proved to be somewhat variable when the anode 

 was made of commercial copper; while with electrolytic 



4 Loc. cit. 



