The methods of chemical analysis may be classified according to the type of reaction: (I) dry or blowpipe analysis, which consists in an examination of the substance in the dry condition; this includes such tests as ignition in a tube, ignition on charcoal in the blowpipe flame, fusion with borax, microcosmic salt or fluxes, and flame colorations (in quantitative work the dry methods are sometimes termed " dry assaying "); (2) wet analysis, in which a solution of the substance is treated with reagents which produce specific reactions when certain elements or groups of elements are present.
Heat the substance with a bead of microcosmic salt or borax on a platinum wire in the oxidizing flame.
Titanium oxide when fused with microcosmic salt in the oxidizing flame yields a bead which is yellowish in the heat but colourless after cooling.
Magnesium ammonium Microcosmic phosphate; salt.
Tantalum pentoxide, Ta205, is a white amorphous infusible powder, or it may be crystallized by strongly heating, or by fusing with boron trioxide or microcosmic salt.
Microcosmic salt: MH 2 PO 4 = MP0 3 +H 2 0, (NH 4) NaHPO 4 = NaP03+NH3+H20; they may also be obtained by acting with phosphorus pentoxide on trimetallic orthophosphates: Na3P04+P205 = 3NaP0 3.