;> >7t'> C. A. Peters — Electrolysis of Sodium Chloride 



Bunsen burner under the crucible lighted. The temperature 

 in the crucible was 500-600°. 



After the reduction was over, the flame was lowered and 

 withdrawn and the anode cooled for a minute in the current of 

 hydrogen. Occasionally when the cover was loose the air got 

 in and caused the mixture to explode, or the hydrogen escaping 

 burned at the edges of the crucible. This did no harm, but a 

 cover fastened tightly to the crucible should not be used. 



In Part 1 of Table III, which follows, are recorded in the 

 order in which they were obtained the results of reducing the 

 anode containing, each time, the chorine from 50 c '" 3 of 'IN 

 sodium chloride solution (equivalent to "1773 grms. chlorine). 

 The same plated anode was used throughout the series, being 

 reduced each time after fusion and weighing, and then used in 

 electrolysis to hold more chlorine. , 









Table II] 











Chlorine 

 added 



by 



electrolysis 



Sum of 



amounts 



of chlorine 



added 



Chlorine 

 lost 



by 



reduction 



Sum of 



amounts of 



chlorine 



lost by 



reduction 



Chlorine 

 unreduced 

 remaining 



on anode 



Time 



of 



heating 





grms. 



grms. 



grms. 

 Part 1. 



grms. 



grms. 



min. 



1 



•1775 







•1387 







•0388 



5 



2 



•1771 



•3546 



•2111 



•3498 



•0048 



10 



3 



•1770 



•5316 



•1791 



•5289 



•0027 



25 



4 



•1781 



•7097 



•1767 



•7056 



•0041 



20 



5 



•1775 



•8872 



•1266 



•8322 



•0550 



9 



6 



•1743 



1-0615 



•1234 



•9556 



•1059 



15 



7 



•1780 



1-2395 



•1782 

 Part 2. 



1-1338 



•1057 



19 



8 



•1770 





•1768 







•0002 



20 



9 



•1768 



•3538 



•1768 



•3536 



•0002 



13 



In column 5 are recorded the differences between the sum of 

 the amounts of chlorine added to the anode by electrolysis and 

 the sum of the amounts lost by reduction ; in other words, the 

 amount of chlorine still remaining on the anode. 



It is seen that five or ten minutes heating in hydrogen is not 

 sufficient to reduce all the silver chloride to silver, and that if 

 the anode is used in electrolysis with some silver chloride still 

 unreduced on it, the complete reduction of all silver chloride 

 thereafter is hardly possible. 



In Part 2 are recorded two experiments, made in succession 

 with a freshly plated anode. It is seen that when the first 



