136 



Conductivity of Aqueous Solutions. Part V. 



values at all temperatures are scarcely greater than the possible experi- 

 mental errors of the separate determinations. Remarkably enough, the 

 same is true, in the case of the hydrochloric acid, of the still more dilute 

 solutions, 0.002 and 0.0005 normal. In the case of sodium chloride at 

 these two concentrations the final values at 18 are as a rule somewhat 

 larger than the initial values, but on an average only by 0.5 per cent. In 

 the case of sodium acetate, on the contrary, the final values are smaller by 

 0.3 to 0.4 per cent for the 0.002 normal solution and by 1.0 to 1.5 per cent 

 for the 0.0005 normal solution. 



Table 35 contains a summary of the mean values of the equivalent 

 conductances given in table 34, after correcting them upon the basis 

 described in section 16, Part II, for the change in conductance caused by 

 the heating (only, however, in cases where the initial and final values at 18 

 differed by more than 0.25 per cent). The acetic acid values given under 

 the heading "corrected" were obtained by decreasing the "uncorrected" 

 values by a fractional amount equal to the ratio of the actual conductance 

 in the bomb of the water (section 51) to that of the solution in question. 

 The values of the concentrations here given are those at the temperatures 

 of the measurements. They w T ere obtained by dividing the concentration 

 at 4 by the appropriate specific-volume-ratio. 



