78 Qualitative Tests. 
Zinc.—On coal with soda, borax, and charcoal in 
R. F., the tin will be reduced, the zine volatilized; the 
tin may then be washed from the fused mass. 
IN THE WET WAY. 
Stannous Oxide (SnO).—1. H:S precipitates dark- 
brown Sn8, soluble in HCl, in alkalies; moderately sol- 
uble in yellow (NH:):8. 
2. HgCl: precipitates white Hg:Cl:, with excess 
black Hg (distinction from stannic compounds). 
3. AuCl: with free HCl or HNOs, a purple precipi- 
tate. 
4. Zn precipitates spongy Sn. 
Stannic oxide (SnO:2). 
1. HS precipitates yellow SnS:, soluble in HCl, 
in alkalies and alkaline sulphides. 
2. HgCl: no precipitate. 
3. AuCls no precipitate. 
4, Zn precipitates spongy Sn. 
Confirm.—By blowpipe tests. 
TITANIUM, Ti. 
WITH THE BLOWPIPE. 
With Borax.—O. F. Colorless to yellow hot, color- 
less cold, opalescent or opaque white by flaming. 
_ BR. F. Yellow to brown, enamel-blue by flaming. 
With Ph. S.—O. F. as with borax. 
R. F. yellow hot, violet cold. 
HCl Solutions.—If soluble, the substance may first 
be fused with S. Ph. or with soda, and reduced. If 
then dissolved in dilute acid and heated with metallic 
tin, the solution will become violet after standing. — 
Usually there will also be a turbid violet precipitate, 
which becomes white. 
