504 
Book II. 
Division II. 
SALTS OF 
When repeatedly washed with water, its acid is carriéd 
off, and the orange oxide of copper only remains *. 
From the experiments of Proust, compared with those 
of Chenevix, this salt seems to be composed of about 
24.75 acid 
70.25 orange oxide 
5.00 water 
100.00 
When this salt is exposed to the air, it very speedily 
attracts oxygen, and is converted into oxy-muriat of 
copper. The sulphat of iron, when dropt into a solu 
tion containing it, precipitates the copper in the metal 
lic state, while it passes itself to the state of oxy-sul 
phat f. 
It dissolves in ammonia, and forms a colourless so 
lution, which gradually attracts oxygen when exposed 
to the air, and at the same time acquires a fine blue co 
lourt. 
Sp. 5. Phospbat of Copper. 
PHOSPHORIC ACID does not attack copper imme 
diately; but when allowed to remain long upon that 
metal, oxidation at length takes place, and the phosphat 
of copper is formed. This salt may be obtained with 
great facility, by pouring phosphat of soda into a solu 
tion of nitrat of copper. A bluish-green powder im 
mediately precipitates, which is phosphat of copper. 
This salt is insoluble in water. Its specific gravity, ac 
* Chenevix, Phil. Trans. 1801, p. 230. 
Proust, Ann. de Cbim. xxviii. 220. 
Id. Jour. de Pbys. li. 182.