326 



On Chemical Tests, 



PROTOXIDE. 



DEUTOX1DE. 



Potash. In a muriatic solution a 

 dark brown voluminous precipi- 

 tate. 



Ammonia. The same as potash. 



Potash produces a white precipi- 

 tate, changing in air to yellow- 

 ish, then brown and finally black. 



Ammonia; a white precipitate 

 which in air soon turns brown 

 and finally at the point of con- 

 tact with the air black. 



Carbonate of potash ; a white pre- 

 cipitate: not changing in air. 



Carbonate of ammonia; the same 

 as carb : potash. 



Phosphate of soda, a white preci- 

 pitate. 



Oxalic acid, and oxalates, pro- 

 duce if the solution be concen- 

 trated, if it contain no muriate 

 of ammonia, and it be not acid, 

 crystals of oxalate of magnesia ; 

 ammonia added assists these 

 tests. 



Prussiate of potash, a white or pale 

 red precipitate soluble in free 

 acids. 



Hydrosulphuret of ammonia, in 

 neutral solutions a yellowish or 

 flesh red precipitate. In air it 

 becomes oxidised and brownish 

 black. 



Liquid sulphuretted hydrogen, and 

 sulphuretted hydrogen gas no 

 precipitate in neutral solutions: 

 if the solutions be made acid 

 and a few drops of ammonia be 

 added a pale flesh red precipitate 

 occurs. 



b. The salts of manganese treated on charcoal with borax before the 

 blow-pipe, produce a bead, which acquires in the outer flame an ame- 

 thyst colour; but this colour disappears in the inner flame ; it however 

 may be made to re-appear by placing the bead again in the outer 

 flame. The smallest portion of manganese can be detected before the 

 bloio-pipe by fusing it, or its salt, with soda on platina foil : the melted 

 mass exhibits a green colour in the outer flame. 



c. If a mineral substance is supposed to contain manganese, reduce 

 it to powder, pour upon it muriatic acid, and apply a moderate heat. 

 If chlorine gas should be abundantly produced »the mineral is chiefly 

 manganese, see 11c, also 41 a. 



Carbonate of potash. The same 



as potash. 

 Carbonate of ammonia. The same 



as potash. 

 Phosphate of soda, in a neutral 



muriatic solution alight brown 



precipitate. 

 Oxalic acid. No precipitate but 



after a time it makes the solution 



col cui less. 



Prussiate of potash, a greyish green 

 precipitate. 



The same as the protoxide. 



These tests produce a milk-white 

 precipitate of sulphur and the 

 deutoxide is reduced to protox- 

 ide. 



