Section 6/. Equivalent Conductance at Round Concentrations. 173 



select the results obtained in the earlier measurements with each solution 

 (those to which a dagger is attached in the table). In order to combine 

 them, those at nearly the same concentrations have been reduced to a uni- 

 form concentration at 4 by means of the formula A 2 C = const. As the 

 agreement of the separate results can best be judged in this way, we give 

 the so-obtained values in table 57. As the final values the mean of these 

 will be adopted. 



Table 58 contains what we regard as the best values which can be 

 derived in the way stated in the preceding paragraphs from the summaries 

 of the separate values given in tables 54, 55, and 57. 



Table 58. Best values of the equivalent conductance 

 at round temperatures. 



SODIUM HYDROXIDE. 



AMMONIUM CHLORIDE. 



2.027 



12.49 



126.6 

 121.5 



398.9 

 379.5 



602.0 

 569.5 



AMMONIUM HYDROXIDE. 



9.853 

 33.07 

 99.90 



9.756 

 5.392 

 3.103 



23.90 

 13.218 

 7.635 



23.52 

 12.968 

 7.513 



67. EQUIVALENT CONDUCTANCE AT ROUND CONCENTRATIONS. 



The values given in table 58 refer to a different concentration at each 

 temperature owing to the expansion of the solution. In order to show the 

 effect of temperature alone they must be corrected to a uniform concentra- 

 tion at each temperature. This has been done with the values for sodium 

 hydroxide and ammonium chloride by means of the empirical equation 

 Aj A 2 = K(C 2 l CJ), which states that the change of the equivalent 

 conductance (A) at any one temperature is proportional to the change in 

 the cube-root of the concentration (C J ) ; and with the values for ammo- 



A -C 



nium hydroxide by means of the mass-action expression const. 



The results are given in table 59. Values extrapolated for a considerable 

 interval are inclosed in parentheses. 



