[ 202 ] 



Application. 



The fp. grav. 1,850 is extrafabular, lying between the tabular 

 fp. gravities 1,8542 and 1,8424, but nearer to the former ; its acid 

 contents are 79,-i4 per cent, then if 200 grains of this acid be di- 

 luted with 3 times that weight of water, we fhall have 800 grains 

 of a dilute acid, which will contain 79,14 x 2 = 158,28 grains of 

 real acid ; then 382 grains (the quantity employed by Klaproth) 

 contain 75,57 of real acid, now 100 grains of deficcated foda 

 contain, as we have feen, 60 of mere cauftic foda, and fince 100 

 grains of mere foda require 127,68 for their faturation, 60 grains 

 of fuch foda fhould require 76,60 ; the difference then between 

 Klaproth's refult and my determination is only 1,03 grains. 



Lastly, it may naturally be expeded, that the refulting neutral 

 fait fhould amount to the joint weight of the real acid and mere 

 alkali, and copfequently fhould in this cafe weigh 75,57 + 60 

 — 135,57 grains, which differs from Klaproth's refult only by 3,07 

 grains, a lofs which may well be imputed to that which the fait 

 fuffers by evaporation. 



These concordant experiments fully prove the accuracy of the 

 table of vitriolic acid to a large extent, and of the proportion of in- 

 gredients I have afligned to foda, vitriolate lartarin and Glauber ; 

 for as Klaproth's experiments were made with an acid whofe fp. 



grav. 



