44 CONDUCTIVITV OF ROSANILINE HYDROCHLORIDE 



K° & K^^ = Specific conductivity of solvent (in reciprocal 

 Siemcn's units) at t = 0° — 25°C. 



/fj" & A^i^^ = Specific conductivity of solution (in reciprocal 

 Siemen's units) at t = 0°— 25°C. 



X* = Molecular conductivity of the solution at dilution 

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



\, \, etc. == corrected ^'alues of the conductivity of inde- 

 pendent experiments. 



C = temperature coefficient of the electrical conductivity 

 for the interval 25° — 0°C. 



e = dielectric constant at 20° C. 



Conductivity of Fuchsine in Wate7\ All the water used in 

 these experiments was prepared in the usual way, either by 

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

 method used by Jones and Lindsay^. 



Quite a little difiiculty 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 — 1.6x10"^ (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). 



