164 Dr. G. Gore on the Relation of Volta Electromotive 



Notwithstanding the loss of heat during dilution, the mean 

 electromotive force had greatly increased. The electromotive 

 force was quite variable in the acid solutions owing to their 

 great degrees of strength and the evolution of gas. 



Experiment 18. 



Partly diluted Sulphuric Acid + Water. 



The acid was sufficiently diluted to prevent the formation 

 of a definite hydrate by chemical union. 



30 c.c. of H 2 S0 4 in 20 c.c. of water ) Temp, before mixing 13 - 

 20 c.c. of water \ „ after „ 24*0 ' 



Increase 11-0 0. deg. 



E.M.F. with Cd + Pt at 15° C. 



Volts. Volts. 



Water 10 ^ ^ ^'^tm \ Mean EMF ' * Wei ^ t= * 9585 



The diluted solution =1-1960 



p. cent. 



Increase = -2375=24-68 



Notwithstanding the great loss of heat, there was a large 

 increase of the mean amount of electromotive force. 



Experiment 19. 



Concentrated solution of Caustic Potash + Water. 



c. 



377 grns. of KHO in 233 c.c. of water j Temp, before mixing 11*74 

 155-7 c.c. of water \ „ after „ 11*76 



Increase *02 C. deg. 



E.M.F. with Cd + Pt at 17° C. 



Volt. Volt. 



The diluted 'solution' ' " ,..,,... =-8929 



■ p.cent. 



Increase -0150 = T7 



Experiment 20. 



Diluted solution of Caustic Ammonia + Water. 



C. 



94*7 grains AmHO in 97- 9c.c. of water) Temp, before mixing 13*46 

 62-8 c.c. of water ( „ after „ 13-56 



Decrease *10C. deg. 



