of Electrolytes on Volta-electromotive Force. 491 



therefore to ascertain whether the same effect occurred when 

 two electrolytic substances united chemically together I made 

 two experiments, in each of which the combined influences of 

 dilution and strong chemical union cooperated together. I 

 took in each experiment the same fixed quantity of the same 

 mixture of *365 grain of hydrochloric acid and 18 grains of 

 water as before, and added to this diluted acid four unit 

 quantities in succession of a mixture of *088 grain of NaC 2 3 

 and 89*1 grains of water in one experiment, and *115 grain 

 of K 2 C0 3 and 89*1 grains of water in the other. The total 

 quantity of alkali added in each experiment was just sufficient 

 to neutralize two thirds of the acid. The following curves 

 show the results : — 



Fig. 10. 



HC1+K 2 C0 3 +H 2 0, 



With CdPt at 19° C. 



Fig. 11. 

 HCl+Na 2 C0 3 -t:H 2 0, 

 with CdPt at 19° C. 



Volts. 



1-12 



n 



1-11 



H 



1-10 



H 



1-09 



H 



1-08 



II 



1-07 

 1-06 





1-05 



|S 1 . K 



1-04 



E9B ■ - 



1-03 



E 



1-02 



mh 



G rains of water. 



Grains of water. 



These curves show distinctly, 1st, the greater degree of in- 

 fluence of the first unit quantity of substance added than that 

 of the succeeding one, and prove the existence of the same 

 phenomenon in cases of strong chemical union ; and, 2nd, 

 that strong chemical union increased the magnitude of the 

 phenomenon. 



To determine the influence upon the phenomenon of strong 

 chemical action alone, apart from that of dilution, I made a 

 precisely similar experiment to the last one, but employing 

 anhydrous carbonate of sodium and omitting the unit quan- 

 tities of water. The following curve represents the results : — 



2M2 



