1839.] 



On Chemical Tests. 



851 



16 Potash, chromate. 



17 ,, bi-earbonate. 



18 ,, bin-oxalate. 



19 „ iodide. 



TABLE OF RE-AGENTS. 



20 Potash, prussiate. 



21 ,, red prussiate. 



22 Soda phosphate. 



23 Sulphuric add. 



24 Sulphates. 



25 Sulphuretted hydrogen. 



26 Tin, proto-muriate. 



27 Zinc, metallic, 



Iron— peroxide. 1, 2, 14, 15, 17 cause reddish brown precipitates. 



3 black precipitate. 25 milky white. 20 immediate dark 

 blue. 21 no precipitate. 22 white precipitate. 



Lead— 1, 2, 5, 10, 12, 14, 15, 17, 20, 22, 23, 24 produce a white preci- 

 pitate. 3, 25 give black precipitates. 27 metallic precipi- 

 tate in the form of blackish grey shining spangles. 16, 19 

 produce a yellow precipitate; the precipitate by 16 when 

 digested in caustic alkali assumes a fine scarlet colour. 



Lime — 1,2, 14, 15, 17, 22 act the same as they do on barytes. See 

 Barytes in this table. 12, 13 produce a white precipitate : 

 23, 24 also produce a white precipitate, but the solution must 

 be concentrated, and not dilute. 3, 20, 21 produce no preci- 

 pitate. 



Lithia — 22, if ammonia be added, produces a white precipitate ; 12, no 

 precipitate. 



Magnesia — 1, 15 produce a bulky precipitate, soluble in muriate of 

 ammonia; 14 produces a voluminous flocculent precipitate. 

 2,3, 13, 17, 20, 21, 23 produce no precipitate. 



Manganese — protoxide. 1,14 white precipitates changing to brown 

 and black. 2, 15, 22 white precipitate not altered by expo- 

 sure to air. 3 yellowish red precipitate. 20 white or pale 

 red precipitate. 21 brown precipitate. 



deutoxide. 1,2, 14, 15, 17, 22 brown precipitates. 20 greyish 

 green precipitate. 25 milk white precipitate. 



Mercury— protoxide. 1, 3, 14, 25 produce a black precipitate. 17 

 white precipitate, turning black on boiling. 10, 12, 20, 22 

 white precipitates. 19 greenish yellow precipitate. 16 red 

 precipitate, peroxide; 1, 2, 12, 22 white precipitates. 14, 21 

 yellow precipitates. 3, 25 black precipitates. 19 cinnabar 

 red precipitate. 20 white changing to blue. 



MoLYrnENUM— (The molybdates of potassa and soda give a precipitate 

 with almost every metallic solution). 9 gives a white preci- 

 pitate in solutions of molybdenum, so do the muriates of zinc, 

 and manganese. The muriate of cobalt gives a rose coloured 

 precipitate, and 26 a blue precipitate. 5 produces a bright 

 yellow colour and 20 a dark brown precipitate. 



