384 C. A. Peters — Electrolysis of Sodium Chloride 



1"2-1'5 amp. at the start, and stop at O'l ampere. Take out 

 the anode, hold it over the inner cell and wash with the jet of 

 the wash hottle. Introduce into the heating apparatus — the 

 electric furnace or the heating crucihle — heat at 400-450°, and 

 raise the temperature during 5-10 minutes until the silver 

 chloride is fused, avoiding temperatures over 550°. Cool and 

 weigh. Titrate the liquid over the mercury to near the end- 

 point, using methyl orange with 'IN hydrochloric acid, then 

 transfer to a separatory funnel and shake well to decompose 

 the remaining sodium amalgam. Draw off the mercury and 

 finish the titration, using sodium hydroxide to determine the 

 end-point. In case violent shaking introduces suspended mer- 

 cury into the liquid, making the end-point difficult to deter- 

 mine, the mercury may be allowed to settle out, or the mixture 

 may be filtered, or more methyl orange may be added. , 



Results. — Following these directions, a few experiments 

 were made using 50 cm3 of *1N sodium chloride solution (*2923 

 grms. NaCi) to determine the accuracy of the process in the 

 hands of the present investigator. One hour was the time 

 required to make a single determination. The results given, in 

 the order in which they were obtained, follow in Table VI. 



Table VI. 



Time 

 Time of 

 of heat- Temp, of 

 Chlorine Sodium electro- ing heating Error. 



No. found found lysis anode 





grms. 



grms. 



mm. 



mm. 



1 



•1755 



•1152 



19 



10 



2 



■1771 



•1159 



21 



23 



3 



•1770 



•1158 



18 



14 



4 



•1781 



•1166 



18 



13 



5 



•1775 



•1157 



20 



19 



6 



•1743 



•1132 



20 



72 



7 



•1780 



•1161 



19 



7 



8 



•1767 



•1155 



19 



6 



anode Chlorine 

 C°. grms. 



390 



455 



410 



460 



550 



458 



400 



470 



j 400 



J 450 



| 450 



| 480 



j 405 



{ 440 



\ 405 



] 440 



— •0018 



— ■0002 



— •0003 

 + •0008 

 + •0002 



— •0030 

 + •0007 



— •0006 



Error. 



Sodium 



grms. 



+ •0002 

 + -0009 

 + -0008 

 + •0016 



+ •0007 

 — •0018 

 + •0011 

 + •0005 



Aver. -1768 "1155 19 —'0005 + -0005 



The fifth column shows the temperature of the electric oven at 

 the beginning and end of the heating. 



