Force to Latent Heat Sfc. of Electrolytes. 163 



force given in "Fig. 8" on page 489 of the Philosophical 

 Magazine, Dec. 1890, as showing an increase of electro- 

 motive force on dilution. 



C. 

 20 grains of KC1 in 20 c.c. of water I Temp, before mixing 14-50 

 180 c.c. of water ( „ after „ 14-54 



Increase "04 C. deg. 

 E.M.F. with Zn+Pt at 21'5° C. 



Volts. Volts. 



The strong solution = 1-1850 j Ar tut-p i • i u. t -iooi 



Water . . ? = 1-1270 [ MeanE - MF - hy weight = 1-1331 



The diluted solution =1 -2550 



— — - — p. cent. 

 Increase -1219 = 10-75 



The mean electromotive force had increased 10*75 per cent, 

 notwithstanding that there was not only no absorption, but 

 even a slight evolution and loss of heat daring the act of 

 dilution. 



Experiment 16. 



Saturated solution of Caustic Soda + Water. 



C. 



600 grains of 90 per cent. Soda in ] m , c • • i - * ( 



o- 5 n , r Temp, before mixing Lr/4 



3/ c.c. of water ' 



3814 c.c. of water after " 23>85 



Increase 8-14 C. deg. 

 E.M.F. with Cd + Pt at 18° C. 



Volt. Volt. 



The saturated solution = -9072 ) Ar p Ar n i •■,, oor\^ 



Water = -850 f Mean E3LF - h ? ™ght = -8602 



The diluted solution =-80004 



p. cent. 



Increase -0298 =3-46 



Experiment 17. 



50 c.c. of Concentrated Aqueous Hydrochloric Acid + Water. 



0. 

 655 grains of absolute HC1 in 250 ] m n c • • t 4 -, ^ 



grains of H,0 . Tem P" le J ore mixm ? ^12 



381-5 c.c. of water » after » 16 " 52 



Increase 2-40 C. deg. 

 E.M.F. with Cd + Pt at 18° C. 



Volts. Volts. 



Wate^ nC6Ilfa,atedaCid ^ 1 |50 2 | Mean E.M.F. by weight = -9148 



The diluted acid' =l'2u^ 



■ p. cent. 



Increase '2869 = 31-39 

 M2 



