294 



Conductivity of Aqueous Solutions. Part IX. 



equations is the expression of the mass-action requirement that the 

 product of the concentrations of the free acid and base be the same when 

 the ion-concentrations are the same. 



Table 123. Conductance of the salt with an excess of acid or base and its hydrolysis. 



Tem- 

 pera- 

 ture. 



18 



25 



Milli-equivalents per liter. 



Salt. 



20.025 

 20.025 

 20.0GS 

 20.068 



50.06 

 50.06 

 50.10 

 50.10 



20.000 

 20.000 

 20.044 

 20.044 



50.00 

 50.00 

 50.04 

 50.04 



19.968 

 19.968 

 20.013 

 20.013 



49.92 

 49.92 

 49.96 

 49.96 



Acid. 



19.96 

 10.13 



49.14 

 24.45 



19.94 

 10.12 



49.08 

 24.43 



19.91 

 10.10 



49.01 

 24.39 



Base. 



10.95 

 19.78 



24.60 

 45.29 



10.93 

 19.75 



24.57 

 45.23 



10.91 

 19.73 



24.53 

 45.17 



Specific conductance X 10 6 . 



Solution. 



Observed. Corrected 



1,099.8 

 1,100.6 

 1,100.5 

 1,099.8 



2,622.9 

 2,632.7 

 2,622.9 

 2,623 . 3 



1,765.4 

 1,767.6 

 1,767.4 

 1,766.4 



4,200.0 

 4,215.3 

 4,201.3 

 4,195.9 



2,042.2 

 2,047.6 

 2,050.9 

 2,047.4 



4,873.9 

 4,894.7 

 4,866.4 

 4,859.9 



1,096.8 

 1,098.4 

 1,100.3 

 1,099.5 



2,621.7 

 2,631.7 

 2,622 . 6 

 2,623.0 



1,761.2 

 1,764.6 

 1,767.0 

 1,765.9 



4,194.1 

 4,210.3 

 4,200.9 

 4,195.5 



2,039.6 

 2,045.4 

 2,050.4 

 2,046.8 



4,861.7 

 4,885.1 

 4,865.9 

 4,859.4 



Salt in 

 solution. 



1,095.5 

 1,096.0 

 1,100.3 

 1,099.5 



2,620.4 

 2,629.2 

 2,622.6 

 2,623.0 



1,758.8 

 1,760.1 

 1,767.0 

 1,765.9 



4,191.6 

 4,205.5 

 4,200.9 

 4,195.5 



2,036.6 

 2,040.0 

 2,050.4 

 2,046.8 



4,85S.7 

 4,879 

 4,865.9 

 4,859.4 



Concentra- 

 tion (C ) 

 of salt in 



wateralone 



20.555 

 20.562 

 20.644 

 20.629 



Percent- 

 age hy- 

 drolysis 

 (100A o ) 



2.71 



2.68 



2.87 

 2.88 



*Omitted in the computation of the mean. 



It will be seen from the last column of table 123 that the values of 

 a. d. (the average deviation of the separate hydrolysis values from the 

 mean) are about 0.10 at and 18, and 0.15 at 25 for the more dilute 

 salt solution. The deviations for the more concentrated salt solution 

 are much less than these. It is to be remembered in this connection 



