1907.] 



MAGIE— THEORY OF SOLUTIONS. 



143 



potassium chlorides, hydrates and nitrates, for which the differences 

 of the values of C are 22, 17, 22, and of F are 8, 9, 11.5. It is not 

 found to hold generally true when the barium and strontium chlo- 

 rides and nitrates are compared with sodium chloride and nitrate. 

 In these cases, I am informed by Professor Hulett, there are rea- 

 sons to believe that there is a double dissociation of the barium and 

 strontium salts ; in which case an agreement could not be expected. 



KCl, 



A = 96, C 



53; D = 47, r = 22. 



NaNO, 



A-55, C 



20; Dz=37.5, F = 24. 



NH^Cl, 



39, C 



23.1 ; D = 43.5, F = 36. 



The constant C expresses the heat capacity of the ions added to 

 the loss of heat capacity (considered therefore as a negative quan- 

 tity) of the water associated with them. The negative number 

 obtained by adding C, which is always negative, to the negative 

 value of the heat capacity of the ions should express the loss of 

 heat capacity of the water associated with the ions. If we use for 

 the heat capacity of the ions the heat capacity of the molecule com- 



