THE 
LONDON ann EDINBURGH 
PHILOSOPHICAL MAGAZINE 
AND 
JOURNAL OF SCIENCE. 
[THIRD SERIES.] 
MAY 1836. 
LXVI. On the Action of Hydrochloric Acid on certain Sul- 
phates, and particularly on the Sulphate of Copper. By 
Rosert Kane, M.D. M.R.LA.* 
HE following experiments were instituted in consequence 
of some results casually arrived at, whilst engaged on 
another subject ; and as they possess a certain interest with 
regard to the theory of the hydracids, and are also additions 
to the number of real facts in chemistry, I have considered 
them deserving of the notice of the Royal Irish Academy. 
When bluestone (S+ Cu) +5 H, is dissolved in liquid mu- 
riatic acid, there is produced a considerable reduction of tem- 
perature, viz. from about 65° to about 35°. The solution 
becomes deep grass green, and by evaporation yields needles 
of hydrated chloride of copper. If there is taken a quantity 
of sulphate of copper corresponding to the atomic weight, and 
a quantity of liquid muriatic acid corresponding to an atom of 
dry acid, and the solution be effected by heat, on cooling, 
the whole solidifies into a fibrous mass of hydrated chloride 
of copper, and there is no bluestone remaining undecomposed. 
The sulphuric acid remains in the water. When the atomic 
proportions are not accurately preserved, small crystals of 
bluestone are scattered through the mass of chloride; but the 
latter can be obtained pure by carefully attending to this 
point. In this reaction we have evidently a complete in- 
* Communicated by the Author, 
Third Series. Vol. 8. No. 48. May 1836. 2N 
