162 Dr. Gr. Gore on the Relation of Volta Electromotive 

 E.M.F. with Cd + Pfc at 18° C. 



Volt. Volt. 



Water r0ngSd . Uti( ? n = "Sv [ Mean E.M.F. by weight = '8898 



The diluted solution -92436 



p. cent. 



Increase -0345 =3-87 



As in each of the foregoing twelve instances there was ab- 

 sorption of heat during the act of dilution, I now examined 

 some cases in which dilution is known to be attended by 

 evolution of heat. Care was taken to select those in which 

 chemical action as usually understood did not operate. 



Experiment 13. 



272 grains of Hydrated Acetate of Sodium in 



Water -f Water. 



0. 



164 grains of the anhydrous salt in ] ^ , £ . . 1POA 



of f, j. , J Temp, before mixing 16*30 



39*o c.c. of water } ? ». ° ln iA 



tkk e ' * I »i after » 16-44 



loo c.c. ot water ) " " 



Increase "14 C. deg. 

 E.M.F. with Cd + Pt at 20° C. 



Volt. Volt, 



The concentrated soln.= -9157/ ,, r -^ Ar -,-, , . ,, Q - 10 



Water = '850 f Mean KM - R b ? ™^*= ^ 12 



The diluted solution = -9072 



p. cent. 



Increase -036 =4-13 



Experiment 14. 



Strong solution of Sulphate of Magnesium 

 in Water + Water. 



C. 

 240 grains of anhydrous MgS0 4 in I T before mixi 15 .^ 



46 c.c. of water * after ^ 



115 c.c. of water J ;7 



Increase -22 0. deg. 

 E.M.F. with Cd + Pt at 20°. 



• Volt. Volt. 



Wa e ter tr ° ng S ° 1Uti ° n = -850 \ Mean E.M.F. by weight = -900 



The diluted solution , = '9787 



p.cent. 



Increase -0787=8-74 



Experiment 15. 



Concentrated solution of Chloride of Potassium + Water. 



This case was selected from the curve of electromotive 



