OF COPPER. 387 



14'928 is very nearly 15, or 3 atoms of oxide of 

 copper ; and 1*975 wants a very little of 2-25 ; 

 this deficit was probably owing to the previous 

 exposure of the salt to a heat of 212. The con- 

 stituents are obviously 



1 atom acetic acid . 6-25 

 3 atoms oxide of copper 1 5 



2 atoms water 2-25 



23-5* 



This salt, is therefore, a trisacetate of copper. 



11. JBerzelius obtained another insoluble ace- 

 tate of copper by heating a dilute solution of 

 subsesquacetate of copper. The salt is deposit- 

 ed in liver brown flocks, which become black 

 when collected on the filter and dried. 100 

 parts of this salt, previously dried in the tempera- 

 ture of 150, gave from 91*6 to 92-5 of oxide of 

 copper; and the acetic acid, determined by 

 means of hydrate of barytes, was 2'392 per cent. 

 Hence, the constituents of the salt are 



Acetic acid . 2-392 or 6-25 



Oxide of copper 92-050 - 240-51 

 Water . . 5-558 - 1 4-522 



100-000 



240-51 corresponds very nearly with 240, or 48 

 atoms oxide of copper ; and 14-522 differs but 



' .\nnalsofPhilosophy, (second series) VIII. 195. 

 Bb 2 



