348 



MR. W. C. D. WHETHAM ON THE IONIZATION OF 



Potassium Bichromate (prepared at the Chemical Laboratory). A recrystallised 

 sample was taken and crystallised twice in a platinum basin, drained, washed, and 

 dried in a water oven, and finally in a vacuum desiccator for seventy-two hours. 

 The operations were carried on as much as possible in the dark. 



5'259 grammes of K 2 Cr 2 O 7 were dissolved in 228'130 grammes of water in a 

 counterpoised flask. This gave a solution of 1'529 X 10~ 4 gramme-equivalent per 

 gramme of solution. For the experiments of Series 2 a dilute solution was further 

 prepared, containing 4775 X 10~ 8 gramme-equivalent, and for Series 4 another of 

 strength 3 '112 X 10~ 6 gramme-equivalent per gramme of solution. 



TABLE VIII. Potassium Bichromate, K 3 Cr 2 7 = 147 '3. 

 August 16, 1899. Solvent, W = 219'61. R = 33860. 



August 22, 1899. Solvent, W = 219'32. E = 31280. 



SECTION 12. Discussion of the Results. 



The results of all these measurements are shown in a graphical form in the curves 

 appended, the values of the ionizations observed being represented by dots surrounded 

 by circles O . Wherever the observations could be connected by a ruled straight line, 



