OSMOTIC PRESSURE 



183 



ordinates over the values of the concentration of NaCl it is 

 noticed that the two curves are approximately parallel (Fig. 47). 



Fia. 47. Parallelism between depressing action of NaCl in the osmotic 

 pressure of a gelatin chloride solution and the curve representing the value 



This shows that the Donnan equation actually accounts for the 

 depressing effect of neutral salts on the osmotic pressure of a 

 gelatin chloride solution, 



