Gooch and Gates — Decomposition of Hydrochloric Acid. Ml 



In the following experiments the silver anode was protected 

 by a layer of silver chloride to restrict as far as possible the 

 surface open to the attack of oxygen. The anode of silver 

 wire, 2'27 mm in diameter and 4 cm long, was first dipped in 

 melted silver chloride and then made the rapidly rotating 

 anode in a preliminary electrolysis of fairly strong hydro- 

 chloric acid until chlorine was freely evolved. In this way 

 the anode was made inert excepting at imperfectly covered 

 points, with the practical effect of very much limiting the 

 active area and, incidentally, of increasing the current density 



Anode. 



silver cm.o(\ lot 



SURFACE. 



TO HtMPEL 

 LEVELLER 



for given strengths of current. Not every anode thus pre- 

 pared was perfect enough to be used through an experiment 

 without formation of colloidal silver chloride, but some ser- 

 viceable anodes were thus obtained, and with them the experi- 

 ments recorded were made. For these experiments the form 

 of the apparatus w T as changed to permit movement of the 

 electrodes and a corresponding adjustment of potential across 

 the electrodes for different concentrations. The apparatus is 

 shown in figure 3. In Table II are given the results in sum- 

 mary. 



