[ i8. ] 



turate 6,5 times its weight of the alkali ; and fince 624 grs. of the 

 nitrous acid would faturate as much alkili as 240 of the vitriolic 

 add, then 260 grs. of it would faturate as much alkali as 100 

 grs. of the vitriolic acid could faturate. Therefore fuppofing 

 100 of the vitriolic acid to contain 75 of real acid, fince more 

 real nitrous acid is required to faturate a given quantity of tarta- 

 rin than of vitriolic acid, in the inverfe ratio of 12 14 to 1177 

 (as appears by the third table,) then denoting the quantity of 

 real nitrous acid in 260 grs. of the nitrous liquor, by x 

 we have the following equation as 1214. 1177 : : x 75. and 

 K — 77555- Then 260 grs. of the nitrous acid contain 77,55 

 of real nitrous acid, confequently 100 grs. of it contained 29,82 

 real acid. And therefore its fp. grav. was nearly 1,234, and that of 



the vitriolic about 1,800. The quantity of alkali in the alkaline 



liquor might alfo on this fuppofition be determined. 



So if it be required to know how much common fait is requifite to 

 decompofeafolution of nitrated filver containing 176,25 grs. offilver: 



ift. I find by the 6th table that 75 grs. filver take 16,54 of ma- 

 rine acid, confequently 176,25 gr. filver take up 38,87. 



2d. By the 4th table, I find that 100 grs. muriatic acid are con- 

 tained in 257,2 of common fait, confequently 38,87 are contained 

 in 99,973, that is 100 grs. common fait, then 100 grs. of it arc 

 neceffary to precipitate the filver. 



ILLUSTRATION 



