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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26 THE METALLURGY OJ ANTIMONY.<br />
the-amorphous sulphide slowly, perhaps giving rise to crystals of the<br />
sulphide. Strong sulphuric acid changes it to the sulphate (Eose,<br />
Websky, Reusgen). Fuming nitric acid attacks it, with the formation<br />
of sulphuric acid and antimonic acid, while ordinary nitric acid<br />
attacks it to form the nitrate and the sulphate, with the separation of<br />
sulphur (JBunsen).<br />
Oxidisers, such as chlorate and nitrate of potassium, decompose it<br />
with explosion. It is also decomposed by a mixture of ammonium<br />
chloride and ammonium nitrate.<br />
The sulphide is sensibly dissociated at about 600° (Gninchant and<br />
Qhretien), and is completely so in the electric furnace of Moissan<br />
(Mourlat).<br />
Thio-antimonious Acids or Sulphantimonious Acids.—These<br />
acids are not known in the free state. In fact, they decompose<br />
immediately after their formation into hydrogen sulphide and<br />
sulphide of antimony. The complex anions of the acids are only<br />
stable in the presence of a neutral solution or in that of hydroxyl ions.<br />
The thio-antimonious acids are in part dissociated into the neutral<br />
and S" ions.<br />
The important thio-antimonious acids or sulph-antimonious acids<br />
are:—<br />
H3SbS3, ortho-thioantimonious acid, or normal sulphantimonious acid<br />
=Sb2S3.3H2S.<br />
H4Sb2S5, pyro-thioantimonious acid, or pyro-sulphantimonious acid<br />
= Sb2S3.2H2S.<br />
HSbS2, meta-thioantimonious acid, or meta-sulphantimonious acid<br />
=Sb2S3.H2S.<br />
H2Sb4S7=2Sb2S3.H2S.<br />
The following are some of the important salts formed from the thioantimonious<br />
acids, according to Pouget and Stauck :—<br />
Chemical<br />
Composition.<br />
K3SbS3<br />
K4Sb2SB<br />
KSbS2<br />
XT QVv Q<br />
ITagSbS^HaO JX2O O4O17<br />
NaSbS2<br />
Na.,Sb4S72H2O<br />
(NH4)3SbS3<br />
NH4SbS22H2O<br />
Colour.<br />
Colourless.<br />
Red."*<br />
Red.<br />
Black.<br />
Red.<br />
White.<br />
Yellow.<br />
Crystal Form.<br />
Crystalline,<br />
Octahedron.<br />
Prismatic.<br />
Octahedron.<br />
Powder.<br />
Crystalline.<br />
Powder.<br />
Needles or<br />
leaves.<br />
Solubility.<br />
Very easily soluble.<br />
Not soluble in cold water.<br />
Easily soluble in water.<br />
Not soluble in water.<br />
Soluble in water; not<br />
soluble in alcohol.<br />
Not soluble in water.
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