246 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



bility of hydrogen at 25 is 0.01926. The results are shown graphically 

 in Figure 48. An examination of the table shows that solubility depres- 

 sion is a specific property of the electrolyte. The depression due to 

 chloroacetic acid is slightly greater than that due to acetic acid. Nitric, 

 hydrochloric and sulphuric acids cause a small, but markedly greater, 

 depression of the solubility. On the other hand, sodium and potassium 

 hydroxides cause a marked depression of the solubility. 



The solubilities may be compared by means of the solubility coeffi- 



o.ooo 



in zn 3* 



Concentration of Added Electrolyte. 



FIG. 48. Solubility of Hydrogen in Water at 25 in the Presence of Electrolytes 



at Varying Concentrations. 



cient for the percentage equivalent solubility change, as defined by the 

 equation : 



(64) 



B' = 100 



S S 



X 



S ^ C' 



In Table XCIV are given the values of the percentage equivalent 

 solubility depression of hydrogen, corresponding to Table XCIII. If 

 the solubility varied as a linear function of the concentration of the salt, 

 the equivalent percentage solubility depression would be a constant. As 

 may be seen by reference to Figure 48, the curves are convex towards the 

 axis of concentrations, which corresponds to a decrease in the solubility 

 coefficient. In Table XCV are given values of the relative percentage 

 solubility depression for nitrous oxide and in Table XCVI those for 

 oxygen at 25 and 15. It will be observed, in the first place, that the 

 percentage solubility effect is in certain cases a function of the tempera- 



