306 Mr. G. Gore. Chemical Energy of Electrolytes [June 14, 



whilst the other remained neutral. I have examined this phenomenon 

 further.) 



The three halogens of the salts were now employed separately. A 

 saturated solution of iodine was prepared by digesting a weighed 

 amount of that substance in a known volume of hot distilled water in 

 a stoppered glass flask with continual agitation ; it contained 1 part 

 of dissolved iodine in 3516 parts of water. 



Table XIV.— Iodine in 465 grains of Water at 13'5° C. 



Grains. 



Volts. 



Grains. 



Volts. 



Grains. 



Volts. 



-1320 



1-374 



-0546 



1-374 



-00015 



1 -0894 



0-1191 



»> 



-0417 





-000132 



1-088 



0-1062 



»> 



0-0288 



it 



-000075 





'0933 





0-0159 





water 





0-0804 





0*003 



1-2659 







0-0675 





-0003 



1 • 1372 







Four other solutions, weaker than 0*000075 grain, gave each 

 1*088 volt. The minimum proportion of iodine required to upset the 

 balance lay between 1 part in 3,100,000 and 3,521,970 parts of water. 

 Except in very weak solutions, variations of strength of the liquid 

 had no effect upon the electromotive force. 



The effects obtained with bromine have already been given in the 

 paper on " The Change of Potential of a Voltaic Couple by Variations 

 of Strength of its Liquid." The smallest proportion of that substance 

 required to disturb the balance lay between 1 part in 77,500,000 and 

 84,545,000 parts of water. By dissolving bromine in the proportions 

 of 0-000075, 0*00015, 0-000165, and 0*00018 grain respectively in 13,950 

 grains of distilled water at 12°C, the three first of these solutions gave 

 the same potential with zinc-platinum as that given by water, whilst 

 the fourth gave 0*0064 volt greater. 



Table XV.— Chlorine in 465 grains of Water at 11° C. 



Grains. 



Volts. 



Grains. 



Volts. 



Grains. 



Volts. 



1 -0695 



2-312 



0-6537 



2-3349 



0-2379 



2 3405 



1 -0002 



2 -3206 



-5844 



2 332 



0-1686 



2-2862 



0-9309 



2 -3349 



0-5151 





-0993 



2-2805 



8616 



» 



0-4458 



2 -3092 



0-0300 



2 226 



0-7923 





0-3765 



2 -3891 







0-723 



2 -2692 



-3072 



2-2577 







The strongest solution was about three-fourths saturated. 



