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



electromotive force as water. The least proportion of the iodate 

 necessary to upset the balance lay between 1 part in 443 and 

 494 parts of water. The increase of electromotive force by increased 

 strength of the solution was nearly regular, as may be seen by 

 plotting the quantities of substance as ordinates to the electromotive 

 forces as abscissas. In order to remove any trace of free iodine, the 

 iodate was previously kept at 100° C. during one hour ; it was then 

 perfectly white and free from odour. 



Table II. — KBr0 3 in 465 grains of Water at 14° C. 



Grams. 



Volts. 



G-rains. 



Volts. 



Grains. 



Volts. 



19-5 



1 -2886 



12 



1-260 



4-5 



1-3344 



18-0 



1 -2743 



10-5 





3 



1 -3000 



16-5 



1 -2772 



9 



1 -3344 



1-5 



1 -2600 



15 



7-5 



in 







13-5 



1 -2972 



6 



>> 







The strongest solution was a saturated one. 



Table III.— Ditto at 15° C. 



Grains. 



Volts. 



1-5 

 1-35 

 1 -2066 

 water 



1-260 

 1-117 

 1 '0884 



Eight other solutions, all of different strengths below 1*2006, gave 

 the same electromotive force as water. The smallest proportion of 

 bromate required to upset the balance lay between 1 in 344 and 

 387 parts of water. The increase of electromotive force by increase 

 of strength of the solution was extremely irregular. 



The effects obtained with solutions of potassic chlorate have already 

 been given in the paper on " The Change of Potential of a Voltaic 

 Couple by Variation of Strength of its Liquid." The smallest 

 proportion of the salt required to disturb the voltaic balance lay 

 between 1 in 221 and 258 parts of water. Three solutions, each 

 weaker than 1*8 grain in 465 grains of water, viz., 0*09, 0'009, and 

 0*0009 grain, gave the same electromotive force as water. 



The following table shows the results obtained with this group of 

 salts : — 



