ON ACETIC ACIfc AND ACETATES. Q3J 



action of muriatic acid. In my process I found but 0*05 

 or 0*06, beyond which there was no sensible variation. His 

 residuum must surely hare contained copper, that had es- 

 caped the very imperfect action of the muriatic acid. 



The distilled acetate of nickel leaves a black residuum, nickel, 

 In muriatic acid 10-000 parts dissolved with a brisk evolu- 

 tion of hidrogen gas; and 0*14 of carbon remained. The 

 nickel in this residuum was found to be in the metallic 

 state; for it yielded the same quantity of precipitate by 

 alkalis as 10*000 parts of nickel, deducting the carbon. 



The residuum of the distillation of acetate of lead is and Ic * <J * 

 in the metallic state. It leaves 0*04 of carbon ; and pre- 

 cipitated from its solution in nitric acid by a sulphate, it 

 yields the same quantity of sulphate of lead as an equal 

 weight of metallic lead. Mr. Trommsdorf has said, that 

 what is left in the retort after this distillation is oxide of 

 lead : but I never found the lead in the process oxided but 

 once, and that was when the retort had cracked. It is only 

 when the acetate of lead is exposed to the contact of air 

 during the distillation, that the metal is oxided, as I have 

 already observed in speaking of the loss it undergoes when 

 exposed to heat in open vessels. 



The residuum of the distillation of all these acetates, which 'All these pr- 

 contain carbon, are more or less pyrophori. It is not at all T0 ^ on ' 

 strange, that charcoal when in a state of minute division 

 should take fire more easily than when compact. 



The residuum of distilled acetate of zine dissolves in raw- Residuum of 

 riatic acid directly, and without effervescence; and 0-050 of ZInc aC 

 charcoal remain. The zinc is in the state of white Oxide, 

 as it was in the salt previous to distillation. 



After the distillation of acetate of iron, black oxide of ""0°* and * 

 iron remains, with 0-02 of carbon. It dissolves in muri- 

 atic acid, and yields the muriate formed by black oxide of 

 iron. 



The acetate of manganese leaves a brown residuum, manganese, 

 When muiiatic acid is poured on it, it dissolves, giving 

 out oximuriatic acid, and leaving 0*035 of carbon. 



We will now proceed to examine the liquid products. 'Liquid pro- 

 The matrass in which they were condensed was constantly ^ Ct n°f thp 

 surrounded with a frigorific mixture, as was its neck also, 



which 



