. Carnegie Institution of Washington publication. OF SALTS IN ETHYL ALCOHOL AND WATER. 95 ISO of this is that the fluidities of a series of such mixtures of alcohol and water tend also to become more nearly a linear function with rise in temperature. In figure 39 we have plotted the conductivities of N/8 solution of sodium iodide in the various solvents with respect to temperature, making ordinates the conductivity and abscissas the temperatures. From this we observe that the temperature coefficients increase slightly with rise in temperature, with the exception of the 95 per cent mixture and
. Carnegie Institution of Washington publication. OF SALTS IN ETHYL ALCOHOL AND WATER. 95 ISO of this is that the fluidities of a series of such mixtures of alcohol and water tend also to become more nearly a linear function with rise in temperature. In figure 39 we have plotted the conductivities of N/8 solution of sodium iodide in the various solvents with respect to temperature, making ordinates the conductivity and abscissas the temperatures. From this we observe that the temperature coefficients increase slightly with rise in temperature, with the exception of the 95 per cent mixture and the pure alco- hol. Further, the increase be- comes smaller as we approach the pure alcohol. The temperature coefficients themselves also be- come smaller as the percentage » of alcohol becomes greater. | The slight increase in the tern- | perature coefficients in the water end is doubtless due to the same cause which produces an increase in the temperature coefficients in pure water, namely, a breaking down of the hydrated ions with rise in temperature. As was said before, the salts of the alkali metal are only very slightly hydrated; therefore, the small increase in temperature coefficients. Further, it is probable that since, with decrease in the amount of water, the increase in coefficients becomes less until there is none in the alcohol, the alcohol does not form alcoholates with these salts. Thus far we have discussed only the relations which exist between the conductivities of the N/8 solutions. Reference to the curves for the other dilutions, figures 41, 42, 43, 44, and 45, will, however, show that the conclusions already arrived at also hold for them. One point which should be noted is that in the case of sodium iodide there are distinct, though slight minima in the curves for N/128 and N/1024 solutions, occurring at about the 70 per cent alcohol. This phenomenon is not at all an unusual one, since practically everyone who has determined the conductivities of other su
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