ON THE STRENGTH OF ACFTIC ACID. J^t 



h'^ve a residuum equal to half the joint bulk of the gasses 

 before fining. * 



(C.) By an errour either of the manuscript or of the prin- Errour cor- 

 ter, carbonic acid gas is stated at the close of the paper [p. "^^'^'^^<^- 

 373, 1. 14], to have aflPovded when electrized, a residuum 

 equal to about Jgth of it? bulk; whereas the qnant'ty of 

 pevinanent gas was one half after removing the undccompo- 

 sed acid. 



W. H, 



Manchester, Dec. 16, I8O9. 



XII. 



Observations on Acetic Acid: by Mr. J. B. Mollerat*. 



JL HE examination of some specimens of acetic acid has Strength of 

 shown me, that the strength of this fluid is by no means in fn proportloa 

 the ratio of its density . to its J^pec. 



I examined an acid, which marked 9^ on the areometer : Twr acicU of 

 its specihc gravity, at the temperature of 125° R. [60*1° F.] very diiTcrent 

 is 1-063. This was compossd of 0-87125 acid and 0-12875 of"(hf,amr* 

 water; and 100 parts saturated 250 of crystallized subcar- gravity. 

 bonate of soda. 



Another specimen of the same specific gravity, and 

 marking the same degree on the areometer, at the same 

 temperature, was composed of 0*41275 acid and 0-58725 

 water; and 100 parts saturated but 118 of crystallized sub- 

 carbonate of soda. 



Number 1 crvstallized completely between 10° and 11°R. 

 [54-5° aud 56-7 F.], and with difficulty became fluid at IS" 

 [72'5°]. 



Number 2 did not crystallize at several degrees below 0. 



The acid No. 1 is the strongest I could obtain, and I be- 

 lieve the purest that can exist. It is without empyreuma, 

 &c. In this state the acid distils with very little fire, and 

 extreme rapidity, without boiling. 



No. 2 was composed artificially by adding to No; 1 the 

 proportion of distilled water indicated by calculation, which 



* Annales de giiimie, vol. LX VII I, p. 88. 



determined 



