ELECTROLYTIC SOLUTIONS IN VARIOUS SOLVENTS 49 



ing solutions in acetone and alcohol. At higher concentrations the solu- 

 tions of potassium iodide exhibit a marked divergence from the aqueous 

 type. While it is true that at 33 the conductance falls throughout 

 as the concentration increases, it will be observed that in the concentra- 

 tion interval between V = 2 and V = 16 the conductance undergoes only 

 an inappreciable increase, whereas at both higher and lower concentra- 

 tions the conductance change is quite marked. This behavior of the 

 more concentrated solutions in sulphur dioxide indicates the appearance 

 of a new type of curve. At a slightly higher temperature this irregu- 

 larity at the higher concentration becomes more pronounced and a maxi- 

 mum and a minimum occurs in the curve, as may be seen from the values 

 given for the conductance of these solutions at 10. The curve at 

 10 is a typical example which is met with in the case of a large 

 number of solvents. 



Before discussing this case in detail, however, let us examine a type 

 of solution the conductance curve of which has a form radically different 

 from that of aqueous solutions. In Table XIV 4 are given values of the 

 conductance of methyl alcohol in liquid hydrogen bromide at 90. 



TABLE XIV. 

 CONDUCTANCE OF CH 3 OH IN LIQUID HBr AT 90. 



V 0.1250 0.2500 0.500 0.769 1.00 2.00 7.69 



A 0.600 0.631 0.211 0.0378 0.00925 0.001660 0.000615 



It will be observed that in the more dilute solutions the conductance 

 diminishes continuously as the concentration decreases. There is no in- 

 dication that, at lower concentrations, the conductance approaches a 

 limiting value other than zero. In the more concentrated solutions the 

 conductance increases greatly as the concentration increases, until a 

 maximum is reached, after which the conductance falls off sharply. It 

 is interesting to note also that, in this solvent, methyl alcohol functions 

 as an electrolyte, although in most solvents methyl alcohol exhibits no 

 electrolytic properties. Actually, however, the solutions of methyl alcohol 

 in hydrogen chloride do not differ materially in properties from solutions 

 of typical salts, such as the substituted ammonium salts in this solvent, 

 although the value of the equivalent conductance is larger for typical 

 salts. 



Another example of this type of conductance curve is that of solu- 

 tions of trimethylammonium chloride in liquid bromine. The values of 

 the conductance at 25 are given in Table XV: 5 



'Archibald, J. Am. Chem. Soc. 29, 665 (1907). 

 "Darby, J. Am. Chem. Soc. 40, 347 (1918). 



