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W. P. Dexter on the Sulphates of Antimony. 85 
Whence their composition was 
i, 
z 
Se eagrii eqvts. 
SbO, 66°97 67:17 
sO, 31:42 5:16 31:39 85:13 
HO (loss) 161 117 144 8105 
100-00 100-00 
and their formula Sb,8,, 1, which requires 
BbO se 2 eee i OTT 
nS Hotes ey ee ee et BOSS 
AK Sb a 8 oe ate gee em DD 
100-00 
The salt is most probably a compound of two atoms of bi- 
sulphate, and one of protosulphate, 28b8.+Sb5,H. - é 
This composition explains the facility with which it is 
changed by prolonged boiling, and concentration of the liquid 
into the bisulphate ; it being only necessary that the equivalent 
of water be replaced by oneof acid. 
The crystals of this salt appear large and well defined, under 
but by exposure of the liquid, or of a solution of the oxyd in 
Calculated. Found. 
SbO, 74-92 73°89 
SO, 20°48 21°59 
HO 4:60 (443) 
100-00 100-00 
Bee same salt, without the atom of water, was made b es 
ndes by the action of alcohol upon the neutral salt, I 
