38 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



FERRIC CHLORIDE. 



It was desired to make a complete investigation of the changes in the 

 conductivity of solutions of ferric chloride in the various solvents. This 

 was desirable on account of the great solubility of the substance in the different 

 alcohols, and because of the large number of ions into which it can dissociate. 

 This part of the investigation had to be postponed. Some few observations 

 were, however, made, and these are recorded. The ferric chloride used was 



I , v = 32 



II, v= 64 



III, v= 128 



IV, v 356 



V, v= 

 VI, t; = 



100* 



Concentration of Methyl Alcohol 

 FIG. 7. LITHIUM NITRATE AT 0. 



prepared as follows: Iron filings, which had been washed with alcohol and 

 ether to remove any adhering grease, were heated in a current of pure, dry 

 chlorine, in a large combustion tube of hard glass. The ferric chloride formed 

 was allowed to distill into a cooled portion of the tube, and then it was re- 

 distilled into a wide-mouthed salt bottle. The excess of chlorine was removed 

 by heating the chloride in a current of dry nitrogen. The chloride thus 

 formed dissolved completely in both alcohol and water. 



Water solutions were standardized as follows: They were reduced with 

 zinc and sulphuric acid, and the ferrous iron determined with standard 



