Sections 50 and 5/. Conductance-capacity and Water Correction. 125 



The variation of these values of the conductance-capacity with the tem- 

 perature was computed upon the basis and in the manner described in sec- 

 tion 36, Part IV. The percentage corrections to be applied to them at the 

 various temperatures are as follows : 



Cells 1 and 11 



Cell in 



51. THE WATER CORRECTION. 

 CONDUCTANCE OF THE WATER. 



In order to determine the conductance of the impurities in the water 

 under the conditions of the experiments, water having about the same con- 

 ductance as that used in making up the solutions was placed in the bomb, 

 which had been previously twice heated to 218 with fresh portions of 

 conductivity water to remove adsorbed substance. The conductance was 

 measured at 18 and the bomb was heated in each of the various baths for 

 the length of time usual in the measurements, being finally brought back 

 in the reverse order to 18. Table 32 contains the results of two such 

 experiments, which served as the basis for the water correction. 



In the case of the measurements with sodium chloride and sodium ace- 

 tate (both with and without acetic acid added) the mean value here tabu- 

 lated of the conductance of the water corresponding to the same stage 

 of the experiment was subtracted from the measured conductance of the 

 solution (except that in the few cases where the solutions were prepared 

 from water having a specific conductance less than 0.75 or greater than 

 0.95 X 10~ 6 these corrections were varied in the ratio of that conductance 

 to 0.85 X 10 -6 , which was the conductance of the water used in the two 

 experiments before its introduction into the bomb). No correction for 

 the impurities in the water was applied to the measured conductances of 



