Electrical Conductance in Absolute Ethyl Alcohol. 



109 



MEASUREMENTS. 

 EXPLANATION OF TABLES. 



Iii the following tables V signifies the volume at which a solution 

 was made up, A the molecular conductance of that solution at the vari- 

 ous temperatures. The method of calculating A is thoroughly familiar. 

 Corrections were applied as described, allowing for the contraction and 

 expansion of the solutions. (The solutions were so dilute that their 

 volume changes with variation in temperature were assumed to be 

 the same as that of pure alcohol.) The values of A 25, therefore, rep- 

 resent the molecular conductance of a solution of volume V at 25. 

 The values of A 15 and A 35, however, represent the molecular con- 

 ductance of a solution of volume 0.98923 V at 15 and 1.01114 V at 35. 

 Only the one value V is given in the tables to save space. All conduct- 

 ances are expressed in reciprocal ohms. 



Concerning the calculation of the temperature coefficients of con- 

 ductance, we have adopted this expression: 



At' -At 

 t'-i 



where At' and At represent the molecular conductivities of the same 

 solution at t' and t (t'>i), and T the temperature coefficient of con- 

 ductance. To find the percentage coefficient of conductance we have 

 used the formula 



T 



where ^ is the percentage coefficient and At the conductivity at the 

 lower temperature. At first the values of At and At' at 15 and 35 

 were corrected for the difference in volume between 0.98923 V and V, 

 and 1.01114 V and V, respectively. This was done in order that com- 

 parison might be made between solutions of the same volume. Later 

 this correction was omitted because of its small value. 



TABLE 65. Sodium Formate. 



TABLE 66. Sodium Acetate. 



