WORK OF II. R. KREIDER. 



91 



alcohol which it was difficult to remove. It was supposed that this unusually high 

 conductivity was due probably to pyridine bases, and that these might be removed by 

 treatment with sulphuric acid. The cold alcohol was treated with a small quantity 

 of dilute sulphuric acid. It was then distilled, the first runnings being always dis- 

 carded, and the receiver removed while a considerable quantity was still in the flask. 

 The alcohol was then boiled with lime for a day and distilled. In some cases it was 

 repeatedly treated with lime and repeatedly distilled. One quantity thus treated 

 gave a conductivity as low as 7.1 X10 -7 . On standing, however, the conductivity 

 changed somewhat, so that not all work was done with alcohol having quite such low 

 conductivity. 



The ethyl alcohol was distilled from lime several times, then repeatedly distilled until 

 it had a conductivity of about 2.6 X 10~ 7 . The water was purified by the method of 



Jones and Mackay. 



SOLUTIONS. 



All solutions were made by direct weighing. In those cases where the solutions 

 were to be very dilute and but a small quantity of the salt was needed, a 0.1 N solu- 

 tion was made as a mother-solution. This was then diluted to a second mother-solu- 

 tion. From this the final dilutions were made directly. Only in a few cases was a 

 final dilution made from an}- other except the first or the second mother-solution. 



All solutions were made up at 20. Enough time was always allowed for the tem- 

 perature to come to equilibrium. The solutions when once placed in the cells were 

 not removed from them until after measurements were made for both temperatures. 

 They were never left in the cells longer than necessary, because of possible decom- 

 position. 



Table 64. Conductivity of Certain Solutions at and 25. 



In methyl alcohol. 



Solution. 



1 



L'O 



Temperature 

 coefficients. 



In ethvl alcohol. 



V 







25 c 



Temperature 

 coefficients. 



Potassium 

 dide 



10- 



Ammonium bro- 

 mide 



Potassium sul- 

 phocyanate . . 



Lithium nitrate 



1,024 

 2,048 

 4,096 

 8,192 

 16,384 

 32,768 



1,024 

 2,048 

 4,096 

 8,129 

 16,584 



1,600 

 3,200 



96.18 

 99.22 

 101 . 14 

 102.4 

 104.8 

 107.2 



69.05 



70.02 



71.48 



72.13 



74.5 



66.6 



66.1 



69.9 

 70.6 

 71.8 

 69.2 



69.1 98.3 

 71.1 ! 101.0 



0.01572 

 0.01620 

 0.01660 

 0.01679 

 0.01627 

 0.01598 



1,024 

 2,048 

 4,096 

 8,192 

 16,584 

 33,168 



23.4 

 28.6 

 29.4 

 32.7 

 32.5 

 32.0 



1,024' 32.1 



4,096 25.2 

 16,384! 27.5 

 65,536 29.8 



0.01690 

 0.01682 



12,800 

 25,600 



1,600 



3,200 



6,400 



12,800 



25,600 



73.0 

 83.5 



58.83 

 59.89 

 61.46 

 59.69 



103.7 

 106.3 



83.24 

 85.98 

 89.29 

 91.35 

 93.61 



0.01682 

 0.01092 



0.01659 

 0.01743 

 0.01811 

 0.02121 

 0.02203 



1,600 



3,200 



6,400 



12,800 



25,600 



1,600 



3,200 



6,400 



12,800 



25,600 



28.2 

 28.6 

 29.2 

 29.23 



28.57 



23.82 

 24.13 



25.63 

 25.87 



36.4 

 44.9 

 47.2 

 47.5 

 47.4 

 47.2 



37.0 



0.02222 

 0.02280 

 0.02422 

 0.01810 

 0.01834 

 0.01900 



0.02047 



39.6 

 39.1 

 39.5 



43.8 



45.7 



46.67 



45.4 



43.64 



36.67 

 38.44 

 40.87 

 40.02 

 43.30 



0.02285 

 0.01687 

 0.01302 



0.02218 

 0.02391 

 0.02393 

 0.02213 

 0.02110 



0.02157 

 0.02372 

 0.02378 

 0.02187 



