198 ACETIC ACID. 



of lead, and pyrolignite of iron, which is an impure 

 acetate of iron ; the salts made with the crude wood- 

 vinegar, or pyroligneous acid, are commonly called 

 pyrolignites. 



490. The strongest acetic acid is usually obtained 

 by neutralizing vinegar with carbonate of soda or 

 lime. By evaporating the liquid, a dry acetate of 

 soda or of lime is procured, and these salts, when 

 acted on by strong sulphuric acid, give off acetic 

 acid in the form of a very pungent acid vapor, which 

 may be easily condensed by cold. A small portion 

 of water distils over with the acetic acid, and is con- 

 densed with it, forming a very strong solution. 



