1839.] 



On Chemical Tests. 



353 



16 Potash, chromate. 



17 bi-carbonate. 



18 bin-oxalate. 



19 f , iodide. 



TABLE OF RE-AGENT aS 



20 Potash, prussiate. 



21 ,, red prussiate 



22 Soda, phosphate. 



23 Sulphuric acid. 



24 Sulphates. 



25 Sulphuretted hydrogen, 



26 Tin, proto -muriate. 



27 Zinc, metallic. 



Tin— peroxide. I, 2, 14, 15, 17,22 occasion white precipitates. 12 

 19, 21 no precipitate. 3 yellow precipitate if solution be neu- 

 tral. 25 yellow precipitate, but not immediately. 27 a white 

 gelatinous precipitate. 



Titanium— 1, 14 give white precipitates. 3, 20 green precipitates. 5 

 brownish red precipitate. 



Thortna — 1, 2, 3, 14, 15 produce precipitates. 12, 20 produce a white 

 heavy precipitate. 22 white flocky precipitate. 21,25 pro- 

 duce no precipitate. 



Tungsten — 1, 2, 14, 15 white precipitate. 5 brownish red. 20 dirty 

 yellow. 25 no precipitate. 



Uranium — 1, 14 cause yellow precipitates. 3 dark brown. 20 fine 

 brown. Hydriodric acid, yellow. 5 chocolate brown precipi- 

 tate in neutral solutions. No precipitate by zinc, iron or tin. 



Yttria— 1, 2, 12, 14, 15, 17, 20, 22 all produce a white precipitate. 21, 

 25 produce no precipitate. 



Zinc— 1, 2, 3, 12, 14, 15, 17, 20, 22 procluce white precipitates, some of 

 which are gelatinous. 25 produces a white precipitate in neu- 

 tral, but not in acid solutions. 21 yellowish red precipitate. 

 5 no precipitate. 



Zirconia — I, 2, 3, 12, 14, 15, 17, 20, 22 produce voluminous precipi* 

 tates. 2i and 25 produce no precipitate. 



