44 CONDUCTIVITY OF ROSANILINE HYDROCHL01UDE 



K & K 25 = Specific conductivity of solvent (in reciprocal 

 Siemen's units) at r = 25 C. 



K & K 25 = Specific conductivity of solution (in reciprocal 

 Siemen's units) at T = 25C. 



Xj; = Molecular conductivity of the solution at dilution 

 V with correction for K the conductivity of the pure solvent. 



\, X 2 , etc. = corrected, values of the conductivity of inde- 

 pendent experiments. 



C = temperature coefficient of the electrical conductivity 

 for the interval 25 0C. 



e = dielectric constant at 20 C. 



Conductivity of Fuchsine in Water. All the water used in 

 these experiments was prepared in the usual way, either by 

 the method of Jones and Mackay 1 or the modification of that 

 method used by Jones and Lindsay 2 . 



Quite a little difficulty was experienced with either method 

 even when the distillation was fairly slow. This difficulty 

 was overcome by a drop catcher, so simple that it seems worth 

 description. A four litre flask contained the original distilled 

 water with a little sulphuric acid and potassium permangan- 

 ate. From this a tube passed into a retort, containing distilled 

 water, a little sodium hydroxide, and some permanganate. So 

 far it is identical with the apparatus of Jones and Mackay. 

 Into the neck of this retort was thrust that of a smaller one and 

 the steam had finally to pass out the top of this through a 

 tube with an expanded bulb into a block tin condenser. All 

 the joints in the two retorts were made fairly tight with asbestos 

 paper. Without any trouble this apparatus gave witer of con- 

 ductivity 1.4 1.6 x 10" 6 (reciprocal Siemen's units). 



In the case of water I have given the actual measurements 

 and corrections in some detail. 



The same methods are of course used throughout in all 

 the measurements. 



1. Jones, H. C. and E. Mackay : Araer. Chem., 19, 283, (1897). 



2. Jones, H. C. and C. Lindsay : Amer. Chem., 28, 329, (1902). 



