218 



POTENTIAL DIFFERENCES AND ANOMALOUS OSMOSIS 



saturated KCl solution) ajad obtained a set of curves presented in 

 Fig. 3. At this time some of the salt had diffused from the inside 

 into the outside solution. The p.d. curves in Fig. 3 resemble the 

 osmotic curves in Fig. 2 " sufficiently to suspect a connection 



35 



30 - 



25 



20 



a 



p 15 

 ;§ 



§ 10 



c 



04 5 



-5 



-10 



pH 18 20 22 24 2.6 2fl 3.0 aZ 3.4 3.6 3.8 40 42 44 4.6 4.8 5.0 52 



Fig. 3. Potential difference between salt solutions and external solution in 

 preceding experiment after 1 hour of diffusion. Abscissae are the pH at beginning 

 of experiment; ordinates, p.d. at the end of the experiment. Attention is called 

 to a certain similarity of the curves in Figs. 2 and 3. 



between the two, so that we may assume that the p.d. between 

 the opposite sides of the membrane is the main driving force which 

 (for low concentrations of electrolytes) moves the water from the 

 water side to the solution side of the membrane. 



