78 



COMPLEX SOLUTIONS. MACGREGOR. 



potassium sulphate by 2, concentration in gramme-equivalents 

 per litre by N, and ionization coefficient by a. 



The above table shows that for the solutions to which it 

 applies, the ionization coefficients given by Kay's method agree 

 closely with those given by mine, the differences being in no 

 case greater than a little over 1 per cent., and in most cases a 

 small fraction of 1 per cent. It is worth noting that in the cases 

 in which a difference exists, the second approximation values of 

 Kay's method are in general less divergent from mine than those 

 given by higher approximations. 



If Kay's method involved considerably less labour than mine 

 it would be worth while to carry out a more extensive com- 

 parison in order to determine its general trustworthiness. But 

 the saving of labour, after a little practice with my method, is so. 

 slight, that such a comparison is uncalled for. In cases in which 

 either the available data do not admit of the determination of 

 precise values of the ionization coefficients or only approximate 

 values are desired, sufficiently good values may be obtained, 

 with somewhat less trouble, by the use of Kay's method. But 

 in cases in which precise values are desired, and the data are 

 sufficiently exact to give them, the more exact method is to be 

 preferred, notwithstanding the slightly greater labour which it. 

 involves. 



