4 Scientific Proceedings (ioi). 



with the ions at infinite dilution) of their cations — K + , 9.6; NH 4 + , 

 10.7; Na + , 16.9; Li+ 24.0; 1 Ba + +, relatively higher; 2 Mg ++ , 

 higher than Ba+ + . 3 



The contrast in the effect of sodium and ammonium sul- 

 phates in decreasing the hydrogen ion concentration as compared 

 with the increasing action of the chlorides is noteworthy. 



The peculiar effect of magnesium salts is interesting, especially 

 in that the concentrations for bend in the curves is in each case 

 between 0.5 and 1 molar. We have tried to find an explanation 

 for these peculiarities in Jones' "Hydrates in Aqueous Solutions." 3 

 Jones states, "Magnesium sulphate, like all the other sulphates 

 studied, gives abnormal results. It appears to form no hydrates 

 in aqueous solution, notwithstanding the fact that it crystallized 

 with seven molecules of water of crystallization. It is almost 



Table I. 



Effect of Salts upon the Concentration of Hydrogen Ion of o.i Normal 



Sulphuric Acid. 



Cone. Salt. 



Log. C H+ . 



Cone. Salt. 



Log. C H +. 



Sodium Chloride A mmonium Chloride. 



0 



2 " 



3 " 



4 " 



— 1. 21 



— 0.99 



— O.78 



— 0.57 



— 0.36 



0 



3 " 



4 " 



— 1. 21 



— 1.08 



— 0.98 



— 0.84 



— 0.72 



Magnesium Chloride. Sodium Sulphate. 



0.25 Molar 



0.5 " 



1 " 



2 " 



3 " 



— 1. 21 



— 0.84 



— 0.56 



— 0.56 

 + 0.03 

 + 0.60 



0 



0.25 Molar 



0.5 



1 " 



2 M 



3 " 



— 1. 21 



— 1.60 



— 1.72 



— 1.80 



— 1.88 



— 1.92 



Ammonium Sulphate. Magnesium Sulphate. 



0 



0.25 Molar 



0.5 " 



2 " 



3 '* 



4 " 



— 1. 21 



— 1.61 



— 1.76 



— 1.90 



— 2.04 



— 2.15 



— 2.24 



0.25 Molar 



o.S " 



1 44 



2 44 



3 " 



- 1. 21 



- 1.46 



- 1.52 



- 1-53 



- 1-39 



- LIS 



1 Smith, J. Am. Chem. Soc, 37, 722 (1915)- 

 1 Washburn, Tech. Quarterly, 21, 360 (1908). 



•Jones, Carnegie Institution of Washington, Publication No. 60 (1907). 



