the Solvent in Electrolytic Conduction. 



379 



M. Bouty, that the behaviour of this salt is peculiar ; in fact 

 that its solutions conduct very little better than the solvent 

 alone, whether the solvent be water or alcohol ; and so far 

 as this salt is concerned, solubility does not appear to affect 

 the question of conductivity. 



The other salts experimented with were calcium chloride 

 and nitrate, lithium chloride and nitrate, magnesium chloride 

 and nitrate, ferric chloride and mercuric chloride. 



The calcium nitrate and lithium and magnesium salts 

 were obtained from Dr. Schuchart, of Gorlitz, and the ferric 

 chloride was prepared anhydrous at the Cambridge Chemical 

 Laboratory. 



It is of course impossible to keep these salts perfectly anhy- 

 drous ; but in some cases two sets of measurements were made 

 with the same salt, and identical values obtained ; which 

 would prove that the error due to the salts not being perfectly 

 anhydrous is very small indeed. 



I have employed the methyl -alcohol as a solvent only for 

 the lithium and calcium salts. In all cases the solutions have 

 been obtained by dilution of the first solution ; which was 

 prepared by dissolving a known weight of the salt in 500 

 cubic centim. of the solvent; 250 cubic eentiin. of this solu- 

 tion being introduced into the cell for resistance-measurements. 



These measurements have been made by the method de- 

 scribed in my former paper*, which has been found to work 

 excellently ; and the cell I have used was the same as was 

 employed for the previous determinations. The values for 

 calcium chloride are given again for the sake of comparison 

 with those of the calcium nitrate. 



Salt, Calcium Chloride, CaCl 2 . 

 ^ Equivalent of this salt (5'532 grm.). 







Solvent, 



Water. 







Amount of 





i 



Amount of 







salt in 250 



Conduc- 



Temp. 1 



salt in 250 



Conduc- 



Temp. 



cub. cent, of 



tivity t. 



cub. cent, of 



'■, Ihity. 



solvent. 





! 



solvent. 







^E. 



•015566 



188 



5^ E - 



•001299 



18-9 



40 E - 



■008728 



18-8 



o~u7 E - 



•000681 



189 



8^ E - 



•004626 



18-6 



- 1 - F 



3280 • EJ * 



' -000356 



19 3 ! 



i 



4- E 



100 x * 



•002438 



18-4 





1 





* B.A. Report, 1886, p. 328. 

 t The conductivity of water employed is subtracted from values given 

 in former paper. 



2C2 



