50 Journal of the Asiatic Society of Bengal [February, 1910 



Part II. 





Effect of Dilution. 



A number of experiments were now undertaken with a 

 view to see how far the effect of acid generated during elec- 



trolysis could be reduced by dilution if a large quantity of 

 the solution were used. The following arrangements were 



made. 



About three litres of saturated solution (specific gravity 

 1*334 at 23°C) was prepared from pure crystals, boiled with 

 precipitated nickel carbonate and filtered. The clear solution 

 was put in a bottle (fig. 3) with a tap at the bottom. The 

 bottle was placed on an adjustable stand just over the volta- 

 meter. At the time of experiment a continuous run of the 



solution through the voltameter was maintained by drawing off 



the liquid by a syphon and so adjusting the flow from the 

 bottle as to keep its level always at the same height. The solu- 

 tion in the voltameter was thus continually replenished and 

 the acid developed during electrolysis carried away from it. 

 The rate of fall in the value of the e.c.e. was thus effectually 

 checked. 



Hardly any evolution of gas was noticed. 



Though there was a steady fall in the e.c.e. all through 

 this series, it was evidently very much slower than what was 

 noticed when about the same current was passed through a 

 smaller quantity for the same length of time. 



The solution was again treated with nickel carbonate, fil- 

 tered and subjected to a second course of electrolysis, just to 

 make sure if the removal of the acid developed during the 

 last experiment, by neutralization, would raise the value of the 

 e.c.e. again. This was found to be the case. 



Effect of Nickel Carbonate. 



made with 



tion kept thoroughly stirred with the carbonate in the volta- 



acid 



time of its production. The results are given in Table IV. 



