54 



WORK OF C. M. STINE. 

 Table 41. Comparison of Conductivities Ammonium Chloride. 



In connection with the conductivity of ammonium chloride, Jones and Knight saj': 1 



The value which we found for the conductivity of ammonium chloride differed slightly from 

 those obtained by Kohlrausch, 2 our values being somewhat lower in the more concentrated solu- 

 tions, and a little higher in the more dilute. This difference is probably due to the temperature 

 coefficient which must be added to Kohlrausch's values to transform them from 18 to 25. 



This coefficient was uncertain over any considerable range of temperature. It is 

 evident that our values agree very well with those of Kohlrausch, Jones and West, 

 and Jones and Knight. 



Let us turn, now, to the conductivities of the mixtures of potassium chloride and 

 ammonium chloride. These solutions were mixed in equal volumes. When, for 

 example, a 2.0 N solution of potassium chloride is added to an equal volume of 2.0 N 

 ammonium chloride the assumption that the resulting solution consists of 1.0 N 

 potassium chloride and 1.0 N ammonium chloride is not quite correct, because of 

 the volume occupied by the salt in the added solution. To make the necessary cor- 

 rection for this factor, pycnometer measurements were made with the more concen- 

 trated solutions. In the more dilute solutions this factor is entirely negligible. 



Table 42. Specific Gravity Measurements. 



In table 42, m is the normality; C is the capacity of the pycnometer in cubic centi- 

 meters; W sa it is the weight of salt present in the solution; W Hi0 is the weight of water 

 present in the volume of solution contained in the pycnometer; and V is the volume 

 of water in 1,000 cubic centimeters of the solution. 



Based upon these measurements, the conductivity of the potassium chloride and 

 ammonium chloride in the various mixtures was calculated, on the assumption that 



'Amer. Chem. Jour., 22, 117 (1899). 



nVied. Amer., 26, 161. 



