On the Electrolysis of certain Metallic Chlorides. 425 



partly to the memoirs*, and partly to the information by letter, 

 most kindly communicated, of H. Schroder. 



A . a may be called the specific conducting -power according to 

 equivalents ; s .a that according to volume. 





a. 



A. 



A. a. 



s. 



s . a. 



(NH 4 C1) 2 ... 

 (LiCl) 2 



MgCl 2 



(NaCl) 2 



CaCl, 



0000177 

 160 

 150 

 138 

 134 

 131 

 098 

 077 



107 

 85 

 95 

 117 

 111 

 149 

 158 

 208 



00190 

 136 

 142 

 162 

 148 

 196 

 158 

 160 



1-53 

 2-04 

 1-89 

 216 

 2-20 

 2-00 

 2-95 

 3-87 



0000271 

 326 

 283 



298 

 295 

 262 



289 

 298 



(KC1), 



SrCl 2 



BaCl 2 





Finally, the quantity b, on which the amount of flexure of the 

 curve depends (p. 422), appears in the case of the chlorides in 

 general to stand in relation to the internal friction of the solu- 

 tions, so far as ocular inspection can warrant a judgment on the 

 latter property ; for the liquids which have b large exhibit in 

 general decidedly more viscosity with greater concentration than 

 the restf. On the other hand, nitric acid is still a very mobile 

 liquid even when more concentrated, while it yet (as well as hy- 

 drochloric acid) has b large and exhibits again a diminution of 

 conducting-power from a moderate percentage content onward. 



It seems, then, that other molecular properties than the vis- 

 cosity of solutions come into question here. At all events further 

 data are requisite in order to accomplish a mechanical theory of 

 electrolysis, perhaps upon the basis given by Quincke (/. c). 



Darmstadt, July 1874. 



XLIX. The Electrolysis of certain Metallic Chlorides. ByJ.H. 

 Gladstone, Ph.D., F.R.S., Fullerian Professor of Chemistry 

 in the Royal Institution, and Alfred Tribe, F.C.S., Lecturer 

 on Chemistry in Dulwich College%. 



V^7E have previously shown that nitrate of copper brought 

 ™" into tension by silver and copper in conjunction is decom- 

 posed by free oxygen in solution §. Thinking that chlorine 

 might be substituted for oxygen, we commenced some experi- 



* Pogg. Ann. vol. cvi. p. 226, vol. cvii.-p. 114, Suppl. vol. vi. p. 58; 

 and a Monograph, 1873, Heidelberg. 



t Compare Hankel, Pogg. Ann. vol. lxix. p. 263 ; Wiedemann, ibid. 

 vol. xcix. p. 229; and Beetz, ibid. vol. cxvii. p. 17. 



% Read before the Physical Society, 1875. Communicated by the 

 Society. 



§ Proc. Roy. Soc. vol. xx. p. 290. 



