Qualitative Tests. 59 
IN THE WET WAY. 
1. BaCl and CaCl precipitate white Bas(BO): 
and Cas(BOs):. 
2. AgNOs precipitates white AgsBOs. 
3. Free boracic acid turns turmeric paper brown- 
ish red, becoming more intense when the paper is dried. 
When mixed with HCl to acid reaction and dried it be- 
comes red. 
CADMIUM, Cd. 
WITH THE BLOWPIPE. 
On Coal, R. F.—Dark-brown coat, greenish yellow 
in thin layers. Beyond the coat, at first part of opera- 
tion, the coal shows a variegated tarnish. 
On Smoked Plaster with Bismuth Flua—White 
coat made orange by (NH:):S. 
With Borax or S. Ph.—O. F. Clear yellow hot, col- 
orless cold; can be flamed milk-white. The hot bead 
touched to NazS:0: becomes yellow. 
R. F. Becomes slowly colorless. 
Interfering Elements. 
Lead, Bismuth, Zine.—Collect the coat, mix with 
charcoal dust, and heat gently in a closed tube. Cad- 
mium will yield either a reddish-brown ring or a metal- 
lic mirror. Before collecting coat treat it with O. F. to 
remove arsenic. 
IN THE WET WAY. 
1. H:S or (NH:):S precipitates yellow CdS, in- 
soluble in dilute acids, alkalies, alkali sulphides, or cy- 
anides. Soluble in strong hot HCl, HNOs, and H:SOs. 
2. Zn precipitates from acid and ammoniacal so- 
lutions gray Cd. 
3. KOH and NaOH precipitate white Cd(OH):, 
insoluble in excess; whilst NH:OH precipitate white 
Cd(OH):, which is soluble in excess. 
Confirm.—By blowpipe test. 
