[ i86 ] 



The 3 firft experiments of Hahn not perfedly agreeing with 

 each other, and not having been made with equal accuracy, I 

 omit. 



Morveaus Experiment on the ^antity of Real Acid In Vitriolic Acid^ 

 whofe Sp. Grav. was 1,841. i Eucyclop. 592. 



He took 58 grs. vitriolic acid, whofe fp. grav. at 8°, 5 Reaum. 

 (=51° Fahr.) was 1,841, and poured into -it a folution of acetited 

 barytes until a precipitate ceafed to appear. The precipitate 

 wafhed and dried (by ignition as it would fcem by what he adds 

 in the 2d column of the above page) weigned 110,3 grs. 



Application. 



Vitriolic acid, whofe fp. grav. at si'' of Fahr. is 1,841, would 

 have its fp. grav. lowered to 1,838 at 60" of Fahr.- the degree for 

 which my tables were formed, as I have fhevvn in my remark^ on 

 the alteration by temperature. 



Now the fp. grav. 1,838 is intermediate between the tabular 

 denfities 1,8306 and 1,8424, but nearer to this ; then by the firft 

 problem its acid contents will be found to be 78,24 per cent, then 

 if 100 grs. o^ vitriolic acid of this fp. grav. contain 78,24 per 

 cent, real acid, 58 fhould contain 45,37 of real acid. But 110,3 

 grs. of ignited barytes contain 36,76 real acid, allowing 100 grs» 

 of fuch baryles to contain 33,33 per cent, the difference then be- 

 tween 



