158 Dr. Gr. Grore on the Relation of Volta Electromotive 



Experiment 1. 



Saturated solution of Sulphate of Sodium + Dilute 

 Sulphuric Acid. 



Fahr. 



4 oz. by vol. of sat. sol. of Na 2 SO t ) Temp, before mixing 55*6 



„ „ lvol.H 2 S0 4 +19vols.H 2 Of „ after „ 54-4 



Decrease 1*2 F. deg. 

 E.M.F. with Cd+ Pt at 55°*6 Fahr. 



Volts. Volts. 



Sat. sol. of NaoS0 4 = '993 J ^ , ^ Ar ^ , , n 10 oo 



Dilute H,S0 4 ! . . . =1-28473 | Calc ' mean KM R h 7 ™1. = 1-1388 



The mixture = 11789 



p.cent. 



Increase -0401 = 3-51 



The mean electromotive force had therefore increased whilst 

 heat was being absorbed and rendered latent. 



In all the remaining experiments the influence of dilution 

 with water alone was examined. 



Experiment 2. 



823*5 grains of liquefied " glacial Acetic Acid " 

 (C 2 HA)+ Water. 



Fahr. 



50 c.c.- of glacial acid | Temperature before mixing 57*8 



21 „ water .'...( „ after „ 56*2 



Decrease 1*6 F.deg. 

 E.M.F. with Cd + Pt at 17° C. 



Volts. Volts. 



The^ glacial acid = 1-1074 | MeaQ E . M . F . by weight = 1-0344 



The diluted acid = 1*1074 



p.cent. 



Increase -073 =7-06 



Experiment 3. 



430 grains of Tartaric Acid in 310 grains of Water + Water. 



Fahr. 

 30 c.c. of the strong acid solution j Temp, before mixing . . 53-5 

 20 „ water \ „ after „ . . 53-2 



Decrease -3 F. deg. 

 E.M.F. with Cd + Pt at 61° Fahr. 



Volts. Volts. 



The concent, acid sol. = 1-1417 I MeanE#M<F . hy we i g ht= -9151 



Water = '8o0 \ 



The diluted acid =1-1074 



p.cent. 



Increase -1923=21-0 



