Section 4. Equivalent Conductance at Round Concentrations. 137 



54. EQUIVALENT-CONDUCTANCE VALUES AT ROUND CONCENTRATIONS. 



In order to show more clearly the change of conductance with the tem- 

 perature the values in table 35 have been reduced so as to correspond to 

 the same concentration at all temperatures. This has been done by graphic 



interpolation with the help of the approximately linear function = -f- 



A A 



K(CA) h in the cases of sodium chloride, hydrochloric acid and sodium 

 acetate; and with the help of the function A = K(f) 1 , also approximately 

 linear, in the case of acetic acid. Values extrapolated for any considerable 

 interval are indicated by inclosure in parentheses. The limiting values for 

 zero concentration (A ) were derived for hydrochloric acid and sodium 

 acetate by determining graphically what function of the exponential form 



= -Jf-KiCA) 11 - 1 would best express the results at 0.5, 2, 10 and 100 



(or 75 or 85) milli-normal and extrapolating for zero concentration (see 

 section 42, Part IV). For sodium acetate the conductance values at 156 

 and 218 were first corrected for the hydrolysis of the salt in the way to 

 be described in section 58, before making this extrapolation. The cor- 

 rected values are given in the table below the uncorrected ones. At 18 

 and 100 the hydrolysis is inappreciable. For acetic acid the A values 

 were calculated from those for the other three substances by the law of 

 the independent migration of the ions. 



Table 36 contains the results of these computations. The concentra- 

 tions, as usual in this article, are expressed in milli-equivalents per liter 

 (referred to oxygen as 16.00) and the temperatures are on the hydrogen 

 gas scale. 



Table 36. Equivalent conductance at round concentrations. 



