373 M. Rose on Titanium. [Nov. 



of nitric, acetic, or succinic acids. All these precipitates are 

 soluble, not only in an excess of the acid employed, but also in 

 that of the titanic solution. The filtered solutions contain 

 potash. 



Compound of Titanic and Sulphuric Acids, 



When this compound is heated to redness, the sulphuric acid 

 and water of crystallization are expelled, and the titanic acid 

 remains pure. It is extremely deliquescent, which renders the 

 attempts at analysis mere approximations. It reddens moistened 

 litmus paper strongly. To analyze this compound, it was dis^ 

 solved in muriatic acid, the titanic acid was precipitated by 

 ammonia, and the sulphuric by muriate of barytes. Two expe- 

 riments gave the following results : 



Tilanicacid 76-83 76*50 



Sulphuric acid ....... 7*78 7-56 



Water 15-39 15-94 



100-00 100-00 



Combinations of Titanic Acid, with the Arsenic and Phosphoric 



Acids, 



These have the appearance of alumina ; when dried, they 

 have the lustre of gum arabic. 



Titanic and Oxalic Acid, 

 Two experiments gave the following as the composition of this 

 double acid. 



Titanicacid 74-42 73-77 



Oxalic acid 10-25 10-56 



Water 15-33 15-67 



100-00 100-00 



Titanic and Tartaric Acids. 

 This compound resembles the preceding ; but no analysis of 

 it is given. When heated in contact with air, it becomes witJi 

 some difficulty white ; and when heated without the presence of 

 air, a black powder resembling carburet of titanium is obtained, 

 but its nature was not determined. 



Titanic Acid and Silica, 

 When pure titanic acid and excess of silica are fused with car- 

 bonate of potash, and the fused mass is treated with water, the 

 excess of silica is dissolved by the potash, and an insoluble 

 compound of titanic acid, sihca, and potash, is ol)tained. This 

 compound may be arranged with the salts which are composed 

 of one base and two acids, few of which are obtainable arti- 



