Section 16. Summary of Equivalent Conductances. 



45 



transferred in the cases of the 100 milli-normal and (except at 306) of the 

 10 milli-normal solutions. In the other cases we have adopted the mean of 

 the initial values after correcting it for contamination when this amounted 

 to more than 0.25 per cent, as shown by the differences between the initial 

 and final values at 2G. This contamination-correction is based on the 

 experience that when a solution has once been heated to the highest tem- 

 perature of any experiment it undergoes no further change of importance 



Table 8. Best values of equivalent conductance at round temperatures. 



either upon continued heating at that temperature or upon cooling and 

 reheating. Therefore the difference in initial and final values at 26 cor- 

 responds to the change that had already taken place in the solution when 

 the measurement at the highest temperature was made. Since, however, 

 the conductance of the contaminating substance, if it be a base or acid, 

 would have a smaller temperature-coefficient than that of the salt, it seemed 

 best to apply a percentage correction equal to only two-thirds of this differ- 

 ence at 26.* Instead of reproducing our 26 values in table 8, we have 

 inserted the more accurate ones of Kohlrausch and Maltby at 18. f 



*Mathematically expressed the fractional correction in general at any temperature 



A 26(Fin) A ( (init) A t (Fin) 



, 2 / A,; (Init 



* S V A~~ 



A, 



) 



the last term dropping out at 



the highest temperature of each series of experiments. 



fWissensch. Abhandl. phys.-techn. Reichsanstalt, 3, 210 (1900), 



