ACEtiC ACIO. 43 



1. Four ounces of water flightly acidulated, Pi-odufts of thi* 



2. Four ounces of a liquor more acid than the firft, and which P''o«fs. 

 M. Debuc compares to good vinegar of Saumur. 



3. Eighteen ounces of a very limpid liquor, with a lively 

 and penetrating odour of acetic acid mixed with fulphurous 

 acid. 



The refidue, weighing 38 ounces, appeared toM. Debuc in Therefidue i»^ 

 different layers more or lefs red, according to their diftance J^^^^^y^'^j^J^^^'*'' 

 from the bottom of the retort ; and he found the upper part 

 covered with a whiteilh powder, (lightly inclined to a citron 

 colour, in which he recognifed the prefence of fulphur. 



Barytes, the muriate of lime, and the acetate of lead formed Precipitates 

 immediately confiderable precipitates with the third produa. th'^^pr^dua by 



M. Debuc obferves that the decompofition of the acetate different falts. 

 of lead by the fulphate of copper may be eafily explained ; 

 but that here there is a production of fulphurous acid, and a Sulphurou^s arid 

 decompofition of the fulphuric acid from the abforplion of its 5^^"^ M.^'oe^ 

 oxigen by the vinegar; which is a fingular phenomenon, that buc to fuppofe 

 has no agreement with the affinities of the acidifying Principle J^^J^p'^^^^'j;;^?^^*^ 

 for the acid'ifiubte aud falifiable bafes; he leaves the explanation ated vinegar. 

 of this mat!er to more "experienced chemifts, and only notices 

 that the tranfportation of the oxigen of the fulphuric acid to 

 another bafe, fuggefts the idea, tkat acetic acid isfuperoxigenatcd 

 vinegar. 



M. Debuc fucceeded In freeing his third product frofti the M. Debuc's 

 fulphurous and fulphuric acids, by letting it remain for about PJ^g'^he tl!i/d"* 

 24 hours, on twelve grains of fait of tartar, and about two produft from 

 ounces of black oxide of manganefe pounded fine, and after {ijIPh^r^a'di* 

 thatdifiilling it flowly; by this redification he obtained a pound Acetic acid pro- 

 of pure acetic acid of aiively and agreeable odour, and ofd'<eed, o/>e de- 

 about 10 degrees fpecific gravity; which is one degree lefs than the com- 

 than that of radical vinegar well redified, obtained from acetate mon kind, 

 of copper. 



The author concludes from this, 



1. That the produ6l of two pounds of acetate of lead, treated 

 with an equal quantify of fujphate of copper, is tvirenty-fix 

 ounces; of which four ounces is acidulated water, an equal 

 portion ftrong vinegar, and eighteen ounces acetic acid altered 

 by the fulphurous and fulphuric acids. 



2. That the eightet;n ounces, forming the third product, M. Debuc con- 

 rea'ified as recited, does not differ from that drawn from cryf- '^^^^^'^^I'^l 

 ials of acetate of copper, but by its lefs denfity, ^uced only dif- 



S.Th&t 



