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