80 W. P. Dexter on the Sulphates of Antimony. 
08192 SbS, lost 21 04 OF 
0°5445 74 (73 I: 0:3 
no constant weight being obtained. he . 
he sulphid was then exposed to the same temperature, 1 
a bulb blown upon a narrow glass tube, while the air was dit 
placed by a slow stream of carbonic acid. 
08536 - lost 0-2 
0°5199 aS 0°5 
06488 st 0-4 
0°3920 - 0:25 milligrams, 
these being all products of different analyses; the sulphil | 
was completely converted into the black modification, and the 
weight on repeated trial remained unchanged. he error, 
whatever may be its source, of at most the tenth of one p.% 
becomes insignificant when compared with the tenfold greatét 7 
errors inevitable in the preparation of the salts. 
Tersulphate, or Neutral Salt—Oxyd of antimony and Al 
owder are dissolved in considerable quantity by hot 
concentrated sulphuric acid, the latter with disengagement 
hydrochloric acid, the solvent power of the acid seeming to Ir 
_ crease with its temperature. 6 
_ slender needles, in such quantity, when the acid is saturate¢® 
its boiling point, that the whole becomes a thick semi-fuil 
magma. ‘The crystals are long, four-sided prisms, with termr 
nal faces, set often upon two opposite sides, alike at both ends 
of the prism. They seem to belong to the oblique rhombi 
system. The concentrated acid, in which they have fo 
retains so little of the oxyd in solution, at the ordinary tt 
perature, that it remains clear when diluted with water} bat 
by sulphydric acid a slight precipitate is produced. In 8 
acid, diluted with about half its volume of water, the oxyd# 
the cold is much more soluble, 
_ In the preparation of the salt, the oxychlorid was used 
in preference to the oxyd, as the latter is not easily obtained, 
free f ; and the acid was heated until all waté 
was expelled, and vapor of hydrated acid abundantly giv? 
off. The semi-fluid mass of crystals was brought upon > 
funnel, the neck of which was imperfectly closed by a glass rod, 
and they were then further freed from the acid upon the porous 
which was not heated, and was entered for no other purpos 
When dry, the salt formed a mass of fibrous texture, very much 
resembling asbestos 
. 
My analysis shows this to be the tersulphate, or neutral salt: . 
n cooling, a salt is deposited 2 
