TEMPERATURE COEFFICIENTS. 



203 



and water at and 25, with the single exception of the N/ 10 solution at 

 25. Likewise, in the 50 per cent and 75 per cent mixtures of ethyl alcohol 

 and water, with the exception of the N/ 10 solution at 0. At 25 the N/800 

 and N/1600 solutions show minimum values, these occurring in the 75 per 

 cent mixture. 



TABLE 87. Comparison of the temperature coefficients of conductivity and fluidity. 



(2) A decided fall below the average values for the two pure solvents 

 has been noted in the following mixtures : (a) Copper chloride in methyl 

 alcohol and water, the fall being most pronounced in the 50 per cent mixture ; 

 in ethyl alcohol and water in the 25 per cent and 50 per cent mixtures; in 

 methyl alcohol and ethyl alcohol in the 25 and 50 per cent mixtures. 

 (6) Potassium sulphocyanate in mixtures of methyl alcohol and ethyl alco- 

 hol, the concentrations being N/400, N/800, and N/1600; in mixtures of 

 acetone and methyl alcohol, and in the mixtures of acetone and ethyl alcohol. 



(3) It has been noted that in every case where there is not an actual mini- 

 mum shown by the curves, but simply the falling below the average values, 

 there is a wide difference between the conductivity values in the two unmixed 

 or pure solvents. It is quite evident that this difference must play a large 



