264 W. Gibbs and F. A. Genth, &¢. 
Sulphurous =e solution throws down from solutions of the 
chlori id a dull orange-brown precipitate, which appears ea 
son pea By Petras with an excess of the acid this is reduced, 
there remains a solution of a protosalt of cobalt. 
Sulphuric acid, under certain conditions, converts chlorid of 
Purpureocobalt into the acid sulphate of the same base. 
, _ Zine may be boiled a long time with an acid solution of the 
chlorid os producing decomposition or reduction. Formic 
have no reducing action. Protochlorid of tin 
hee oe unites with the chlorid of Purpureocobalt so as to form a 
chlo 
The chlorid of Purpureocobalt exhibits a remarkable ne 
to unite with metallic chlorids to form chloro-salts. Such 
nue the Spin with the chlorids of Platintit Palladium, 
n, Zine, and various other metals. The chlorid dot 
Parpareocobat even dissolves chlorid of silver in large ata 
doubtless forming with it a double chlorid. It is for this re 
that it is not generally advantageous to prepare the salts of Pur 
uber aren by double decomposition between the chlorid and 
e reactions of a + pure solution of the chlorid of Purpureo- 
cobalt are as * ie tol 
rrocyan assium ~ a yellowish precipitate which 
aaa Ries Seem 
Ferrideyanid of ote ti piven a beautiful bright orange-red 
crystalline precipitate. 
Cobaltideyanid of potassium gives a fine red erystalline pre- 
cipitate. 
Oxalate of ammonia gives a beautiful tral we ae precipitate of 
fine needles. 
Pyrophosphate of soda — a lilac precipitate easily soluble 
in an excess of the precipitan 
Neutral chromate of aah gives a brick-red precipitate. 
Bichromate of potash gives orange-yellow soso 
Picrate of ammonia gives a beautiful yellow precipitate. 
Terchlorid of gold precipitates the shi rid unchanged. 
Bichlorid of platinum a a fine cinamon-brown precipitate 
crystalline scales. 
Sulphid of ammonium gives a black a 
 Chlorid of mercury gives fine rose-red needles, easily decom: 
Bichlorid of tin gives pale peachblossom-red silky needles. 
Rr ig of ammonia eid a pale peachblossom-red pre- 
cipi 
Alkalies and their carbonates give no precipitate. 
Iodid and bromid of potassium give no precipitate. 
