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ON THE SOLUBILITY OP SOME PRECIPITATES. 
ART. XV.-- ON THE SOLUBILITY OF SOME PRECIPITATES 
WHICH OCCUR IN QUANTITATIVE ANALYSIS. 
By R. Fresenius. 
I. Solubility of the Potassio-chloride of Platinum in 
Alcohol. — No free Muriatic Acid present. — a. An excess of 
perfectly pure recently precipitated potassio-chloride of pla- 
tinum was digested with alcohol of 0.805 spec. grav. for 6 
days, at a temperature of 59° to 68°, in a closed flask, with 
frequent agitation. 72.5 grms. of the perfectly colourless 
filtered solution, evaporated in a platinum dish, left 0.0060 
grm. residue dried at 212°. Accordingly 1 part potassio- 
chloride of platinum dissolves in 12085 parts of alcohol of 
0.805 spec, gravity. 
b. The same experiment, made with spirit of 0.873, show- 
ed that 1 part of the salt required 3775 parts spirit of this 
strength for solution. 
c. With spirit of 0.923, 1 part of the salt dissolved in 
1053 parts. 
In the presence of free Muriatic Acid. — Recently preci- 
pitated potassio-chloride of platinum was digested in the 
cold with spirit of 0.873 spec, grav., to which some muria- 
tic acid had been added. 67 grms. of this solution, which 
was coloured yellowish, left 0.0146 grms. platinum, corres- 
ponding to 0.0365 grm. potassio-chloride of platinum; con- 
sequently I part of the double salt dissolves in 1835 parts 
of spirit, containing muriatic acid. 
II. Solubility of the Ammonio- chloride of Platinum in 
Alcohol. — No free Muriatic Acid present. — The author 
found 1 part of this salt to require 26535 parts alcohol of 
0.805 for solution, 1406 spirit of 0.873, and 665 parts spirit 
of 0.228. 
In the presence of Muriatic Acid. — 1 part of the double 
salt dissolved in 672 parts of acidified spirit of 0.873 spec, 
grav. 
