COPPER CHLORIDE. 



177 



In studying the temperature coefficients of conductivity, it is to be noted 

 that in every case, with the exception of pure methyl alcohol, there is an 

 increase in the temperature coefficient with increase in dilution. This in- 

 crease, although not perfectly regular, is, however, decidedly marked when 

 the difference in the value for the most concentrated and for the most dilute 

 solution is considered. It is also to be observed that the temperature coeffi- 

 cients in the 25 per cent mixture are decidedly larger than the corresponding 

 values in either of the other mixtures used. 



TABLE 79. Comparison of the conductivities of copper chloride. 



Tables 78 and 79 (figs. 82 and 83) show that copper chloride, in mixtures 

 of ethyl alcohol and water, also gives a dropping below the rule of averages 

 for the curves in the 25 per cent and 50 per cent mixtures. Here also, the 

 values between the 75 per cent and 100 per cent mixtures show a general 

 tendency towards the rule of averages. It is to be noted also that there is 

 a bunching of the curves in the 25 per cent and the 51 per cent mixtures, or, 



