﻿Manchester Memoirs, Vol. xlix. (1904), No. % 3 



Effect of Conce?itration. 



In the preliminary experiments, using a porous pot to 

 separate the anode from the cathode, the influence of 

 concentration within the limits of 85 to 17 gms of titanium 

 sulphate per litre was very evident, for with a current 

 density of about 7 amperes per 100 sq. cms., and a 

 temperature of 15 to 1 7°C, the yields were as follows : — 



(1) Solution containing 85 gms. Ti(S0 4 ) 2 per litre, 

 75 per cent. 



(2) Solution containing 42*5 gms. Ti(S0 4 ) 2 per litre, 

 33 per cent. 



(3) Solution containing 17 gms. Ti(S0 4 ) 2 per litre, 

 2*2 per cent, of the theoretical for the current used. 



In comparative experiments in which platinum elec- 

 trodes were substituted for those of lead no very great 

 difference in yield could be observed, possibly with lead 

 better results were obtained. 



The estimation of the amount of titanous salt obtained 

 was carried out by titrating a small quantity of the solu- 

 tion from the cell with standard permanganate, after 

 warming to 6o° or jo°C. 



In all the experiments the cathode solution was well 

 stirred, either by a mechanical stirrer or by passing a 

 current of some inert gas. 



