50 CONDUCTIVITY OF ROSAXILINE HYDROCHLORIDE 



ammonium iodide an aliphatic solute, as the following com- 

 parative table shows : 



Dielectric Constant Dissociation at v = 100 

 Solvent Fuchsine N (C H J I 



3 4 



Water 81.7 95^ 91^ 



Methyl Alcohol 32.5 — 34.8 84^ , 73^ 



Ethyl Alcohol 21.7 — 27.4 81^ 54^ 



Acetic Acid 6.46 53^ 



The other empirical relations which Walden himself has 

 worked out are those : 



(2) Between the temperature coetHcient of conductivity 



and the conductivity of infinite dilution.^ 



(3) Between the dielectric constants of the solvents and 

 the molecular dilutions at which they show equal 



dissociation of the same solute. 



I have been unable to find these relations for the con- 

 ductivity of rosaniline hydrochloride in the four solvents used, 

 and indeed it would not be permissible to draw any conclusion 

 with such a limited number of solvents. 



The following table shows the general similarity in the con- 

 ductivity of solutions of the aliphatic and aromatic solutes. 



Solvent ■ Fuchsine N(CH.,)^I Fuchsine N(C H ,)^ I 



Water 87 ... 0.036 



:\Iethyl Alcohol 63.5 124 0.016 0.015 



Ethyl Alcohol 26.2 60 0.024 0.023 



Acetic Acid 12.5 5.6 



1. It is worthy of note that in calculating the temperature coefficient between 15° 

 and 25° W^alden does not use the temperature coefficient c as he has previously defined it 



.T ." 25 15 

 c but as c= — r= 



" <= ;l0 



/ 7 ■'' ilO 



V 



Thif?, of course, does not amount to the same thing. If the temperature coefficient of 

 his acetic-acid solutions is calculated as first defined, it is found to be above .36 instead 

 of .056 and this value when multiplied by the conductivity at infinite dilution 5,6 gives 

 a constant 2.0 which is near the value of 1.3 required according to his empirical law. 



