G2 ONf THE CONDUCTIVITY, SPECIFIC GRAVITY AND 



In what follows I endeavor to ascertain whether or not the 

 above formula is applicable to the specific gravity and surfaec 

 tension of simple solutions of KC1 and K 2 S0 4 and whether or 

 not it is possible to predict the values of these properties for 

 mixtures of such solutions. 



The observations of specific gravity requisite for this purpose 

 were made by the writer in the way described above. 



On surface tension Rother's observations were used. They 

 were made at 15C and his values are therefore not strict!}' 

 comparable with calculated values based on ionization coefficients 

 for 18C. I have, however, reduced a few of the ionization co- 

 efficients of the salts to 1 5C, by using temperature coefficients, 

 and found that the difference between the values for the two 

 different temperatures is not sufficient to cause any appreciable 

 error in my calculated results. Rother's paper has sufficient 

 data for determining the concentration in gramme-equivalents 

 per litre, with atomic weights as used in Table I. Rother 

 regards his observations as possibly in error by +5 to +8 in 

 the third place of decimals. The surface tension of the water 

 he used was 7.357. 



The following table, VI, contains the ionization coefficients 

 for simple solutions, used in the calculations. They were 

 obtained either from direct observations on the conductivity of 

 the solution or by interpolation of the results of Tables I III. 

 The concentrations are expressed in gramme-equivalents per litre 

 at 18C. 



J Kohl. u. Holb., loc. cit., pp. 195-19y, Table 7. 



