[ '9' I 



Application. 



The fp. grav. 1,317 differs infenfibly from 1,316, which indi- 

 cates the acidity 38,97 per cent, and if 100 grains contain 38,97 : : 

 600 fhould contain 233,82 (whereas we have already feen that 600 

 contains 273,56) and when 200 grains more of water were added, 

 then 800 fhould contain 233,82, and confequently 100 fhould 

 contain 29,22 real acid, which indicates very nearly the fp. gray, 

 of this 2d mixture to be 1,237, which differs from Hahn's refult 



i'257 



by ^— !^ by , a difference which, though confiderable, is 



0,020 ■' 1000 



by the half fmaller than that of the ifl experiment, as by the in- 

 terval of time between the ift and 2d experiment the penetration 

 of the 200 grains of water firfl added had increafed.. 



This calculation is grounded on Hahn's refults, which are erro- 

 neous from want of reft and the efcape of vapours. We fliall now 

 fee what the fp. grav. of this lafl mixture fhould be, if both this 

 and the former experiment were more accurately conduded, and 

 the water fo gradually added that little or no heat would be gene- 

 rated, on which principle my former calculation proceeded. This ex- 

 periment may^ be confidered as a mixture of 600 grains of an acid 

 liquor, whofe fp. grav. fhould, by my table, be 1,3621, and whofe 

 acid contents are 273,54 grains with 200^ grains of v/ater, and then 



800, 



