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. 33<br />
Some of the important salts of these acids are:—<br />
(SbO3K).,5H2O. SbO3LL<br />
Sb2O7K4. Sbo07(^H4)Ho.6H.O.<br />
Sb2O7K2H2.6H.2O. (NH4)Sb03. G Ho0.<br />
SbO3Na. (Sb03)oBa.<br />
SbOtf (SbO3\>Mg.<br />
Besides these there are the antimonates of strontium, calcium,<br />
aluminium, manganese, iron, nickel, cobalt, and tin.<br />
Antimony Pentasulphide, Sb2Sv—It is obtained by decomposing<br />
the sulpho-salts with acids. It is called soufre dore d'aniimoine in<br />
French, and Goldschwefel in German. It is generally obtained in a<br />
pure condition from Schlippe's salt:—<br />
2Na3SbS4 + 3HoS04=3NaoS04 + Sb^ + 3H A<br />
or 2Na2SbS4 + 6HC1 = 6NaCl + 3H.2S + Sb.^<br />
According to Bertsch and Harmsen we have:—<br />
S4 + 3SbCl6=4Sb>2S5 +<br />
10N"a3SbS4 + 30HC1+3Sb2O5=8SbIs5 + 30XaCl + 15H2O.<br />
According to L. Prunier, the process is:—Fuse the trisulphide and<br />
sulphur together. The product of fusion is boiled with a solution of<br />
monosulphide of sodium. After nitration, the liquid is concentrated<br />
for crystallisation. This salt is redissolved in a solution with excess<br />
of acid. The pentasulphide is then precipitated.<br />
The pentasulphide is easily dissociated: it loses its sulphur<br />
component partially at 120°, and changes to the trisulphide if the<br />
temperature is raised higher. Hydrogen reduces it (Hoffter). When<br />
heated in air, it oxidises with a flame. It alters in humid air {Otto<br />
and Jahn). Alkaline solutions change it to a mixture of sulphantimonate<br />
and antimonate.<br />
The most important salts of sulph-antimonic acid (HaSbS4) are:—<br />
SbS4Ba3.6H2O. SbS^-f 9H2O.<br />
•(SbS4).2Cd3.<br />
SbS4K3+4H2O.<br />
With other elements we have :—<br />
Sb2Se5, antimony pentaselenide.<br />
Antimony arsenate.<br />
., phosphate.