1^6 Conductivity of Aqueous Solutions. Part V. 



The first column of table 44 contains the date, which correlates the data 

 with those of table 43 ; and the second column, the temperature. The third 

 and fourth columns give the concentrations in the mixture of the sodium 

 acetate and acetic acid, respectively, found by dividing the concentrations 

 at 4 by the specific-volume ratios. The fifth column contains the specific 

 conductance of the mixture, the values at the two higher temperatures 

 being corrected so as to correspond to the even temperatures, 156 and 

 218. In the sixth column is given the specific conductance of the acetic 

 acid in the mixture, calculated as just described. The values in the sev- 

 enth column, which represent the specific conductance of the unhydrolyzed 

 salt, were obtained by subtracting those in the sixth column from those 

 in the fifth. The numbers in the eighth column show the specific conduct- 

 ance of the salt when present alone in water at the same concentration ; 

 they were calculated by multiplying the equivalent conductances given in 

 table 35 by the concentration of the salt in the mixture in question. The 

 ninth column contains the differences between the values of the two pre- 

 ceding columns and shows the decrease in specific conductance produced 

 by the addition of the acetic acid. The last column shows the percentage 

 value of the decrease, referred to the specific conductance of the unhydro- 

 lyzed salt given in the seventh column. 



In connection with these results it may be first stated that the values 

 of the equivalent conductance for unhydrolyzed sodium acetate at 156 

 and 218 already included in table 36 were computed by dividing the mean 

 specific conductance of the "salt in mixture," given in column 7, of table 

 44 by the mean concentration given in column 3, and then interpolating 

 the values for round concentrations and calculating those for zero concen- 

 tration in the way described in the statement preceding table 36. 



It will be seen from the values for the percentage decrease of the spe- 

 cific conductance given in the last column of the table that only at 218, 

 and perhaps in the most dilute solution at 156, are the values greater than 

 the probable experimental error. We shall therefore calculate the hydrol- 

 ysis corresponding only to these values. In order to make this calcula- 

 tion, it is necessary to know, in addition to the foregoing data, the specific 

 conductance of sodium hydroxide. Values for the equivalent conductance 

 of this substance have recently been obtained by Noyes and Kato in this 

 laboratory, and are presented in table 58, section 67, Part VI. From these 

 the specific conductance at any concentration can be readily calculated. 

 The values for sodium acetate at various concentrations are given in the 

 foregoing table in the column headed "salt in mixture." The difference 

 in the specific conductances of these two substances at any concentration 

 represents the decrease of specific conductance which would be observed 



