IT. M. Thornton, Jr. — Estimation of Titanium . 217 



acidified with 12 cm8 to 15 cmS of concentrated sulphuric acid and 

 after evaporation down to a small bulk was transferred to a 

 200 cm!1 deep form basin, evaporated further, and the tartaric 

 acid destroyed by the method above given. Table II shows 

 the results of seven experiments. 



Table II. 

 The Separation of Titanium from Iron. 





Ferric 



ammonium 



Titanic su 



phate = By 



Found 



Error 



Alkali 

 salt 



No. 



sulphate =: Fe 2 3 



standardization Ti0 2 



Ti0 2 





cm 3 . 



grm. 



era 3 . 



grm. 



grm. 



grm. 





1. 



20 



0-1430 



25 



0-1012 



0-1018 



+ 0-0006 



NaHS0 4 



2. 



20 



0-1430 



25 



0-1012 



0-1016 



+ 0-0004 



NaHS0 4 



3. 



20 



0-1430 



25 



0-1012 



0-1015 



+ 0-0003 



NaHS0 4 



4. 



20 



0-1430 



25 



0-1012 



0-1013 



+ 0-0001 



NaHS0 4 



5. 



20 



0-1430 



25 



0-1012 



0-1012 



o-oooo 



NaHS0 4 



6. 



20 



0-1430 



25 



0-1256 



0-1258 



+ 0-0002 



KHS0 4 



V. 



20 



0-1430 



25 



0-1256 



0-1259 



+ 0-0003 



KHS0 4 



A method has been satisfactorily worked out for the separa- 

 tion of titanium from iron and destruction of the tartaric acid, 

 o,f such a nature as to introduce no foreign substance that will 

 contaminate the titanium when subsequently thrown down. 

 Except for the evaporation of the filtrate from the ferrous 

 sulphide, the operations can be quickly performed. Evapora- 

 tion, however, is an operation which does not demand the 

 analyst's constant attention. 



