A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...

THE CHEMISTRY OF ANTIMONY* 29
by dissolving the alkali sulphates and the oxide in concentrated
sulphuric acid. They are :—
Specific Density.
£Ta[Sb(804)o] 3--J08
K[SbSO4)2] 3-3396
} 3-094S
Antimony Nitrate.—It is obtained by dissolving the oxide in
cold fuming nitric acid. On moderate heating it changes to the
pentoxide, which is again converted into the tetroxide on further
heating. Finally the trioxide is produced (Prlif/ot).
Antimony in combination with nitric acid and oxygen gives rise to
two salts : 2Sb/)6.ls T 205 and 2Sb2OvX2O3.
Normal Antimony Acetate, Sb(C2H3O.2)3, is slfghtly soluble in
benzol, and is not soluble at all in etherfetc.
Antimony with Phosphorus forms the following combinations :—
(a) SbP, antimony phosphide, is white and metallic, obtained from
the reaction between phosphorus and liquefied antimony.
(b) Phosphite of antimony.
(c) Sulphophosphate, PS4Sb.
Antimony with Arsenic gives rise to the following :—
(a) Arsenides: SbAs, Sb2As, and SbAs^.
(b) Arsenite.
Complex Salts of Sb'" with Organic Acids.—There is a large
number of these salts. The best known are the salts formed with
tartaric acid and tartar emetic, 2C4H406.SbOK.3HoO.
Some of the complex antimony oxalates are:—
Composition.
NaSb(Co04)o.2£EU0
KSb(G,Ojo.HoO
NH4Sb(d204}o.6H..O
K3Sb(C2O4)3.4H.2O
Na3Sb(Co04)3.5HoO
(XH4),Sb(C204)3.HHo0
IC10Sb2(C2O4)11.iiSH2O
K10Sba(C2O4)u-7H2O
Form.
Large monoelinic prisms.
Cry-ralline needles.
Beautiful prismatic crystals.
Star-grouped needles.
Small rhombic crystals.
White needles.
Monoclinic prisms.
E. The Compoimds of Antimony of 4 Valences.
The number of. these compounds is very small. The important
ones are:—
Antimony Tetroxide, Sb204.—In nature it is known as antimon-
i