CONDUCTIVITY OF SODIUM HYDROXIDE IN AQUEOUS SOLUTION. 



/.'.// / -i mental Verification of the Significant Formula. In order to test the validity 

 >f the formula, two solutions of widely differing concentrations were taken : a normal 

 solution and solution of 40*4 per cent, strength. The approximate values of the 

 expression K~ l <lit/ilt were plotted out against temperature and gave the form of a 

 rectangular hyperl>ola. This is the relation which we get at once by differentiating 

 the above equation, and it may be written in the form 



/I 



\K 



In the two sets of results given below the values of the constants were obtained from 

 this hyperbola, but subsequently a more convenient method for calculating them was 

 devised. 



The constants so obtained were : 

 For normal solution 



a = 0-003182, b = 0-01356, n = 2'493. 

 For 40'4-per cent, solution 



a = 0-00603, I) = 0-0248, n = 4'107. 



Using these constants to calculate the values of K, we obtain the results which are 

 shown in the subjoined Table XVIII. and in Diagram XII. in comparison with the 

 observed results. 



TABLE XVIII. 



Having regard to the method adopted for calculating the constants, and to the 

 experimental errors introduced by the use of glass vessels, the agreement appears to 

 to be sufficiently close to demonstrate the general validity of the relation. 



VOL. cciv. A. 



2 R 



