122 Norton — Action of Sodium Thiosulphate, etc. 



In the following table is shown the effect of treating a solu- 

 tion of titanium sulphate with sodium thiosulphate. Experi- 

 ment 1 was conducted by merely boiling a solution of the 

 reagents named above, filtering off the precipitate and weigh- 

 ing as the oxide. In experiments 2 and 3 the solution of 

 titanium sulphate and sodium thiosulphate was submitted to a 

 pressure of 20 atmospheres in the digester. 







Table 



VI. 









Ti0 2 taken. 



lsTa 2 S 2 taken. 





Ti0 2 taken. 



Error. 





grms. 



grms. 





grms. 



grms. 



1. 



•0240 



2 





•0237 



•0003 — 



2. 



•0240 



2 





•0240 



•OOOOrh 



3. 



•0240 



2 





•0240 



•OOOOi 



These results show that titanium is completely precipitated 

 by sodium thiosulphate either with or without the aid of 

 pressure. 



To recapitulate : I have shown that sodium thiosulphate 

 will completely precipitate aluminum, chromium, zirconium 

 and titanium as the hydroxides with the aid of high tem- 

 perature and pressure. Beryllium is only partially precipitated 

 under similar conditions. Mere boiling for a reasonable time 

 will not precipitate aluminum and chromium, but it is suffi- 

 cient in the case of zirconium and titanium. 



In conclusion I wish to thank Prof. F. A. G-ooch for his 

 kind advice and assistance. 



