[ ^79 ] 



Again, How much deficcated foda will hold as much alkali a& 

 30 parts cryftallized foda ? In the 5th table I fee that 541,1 parts 

 of the cryftallized hold as much alkali as 227,4 parts of the defic- 

 cated, then as 541,1 . 2:^7,4 : : 30 . 12,6. 



Problem nth. 



How much of a given bafis will be requifite to laturatc the- 

 acid contained in a given quantity of a given neutral fait, thus 

 how much deficcated foda will be requifite to faturate the acid 

 contained in 50 parts cryftallized Epfom ? 



By the 4th table I fee that 100 parts real vitriolic acid are con- 

 tained in 340 parts cryftallized Epfom. Then if 340.100 : : 50, 14,7, 

 then by the 3d table I fee that 100 grains of real vitriolic acid 

 faturate 78,32 of foda. Confequently if 100 faturate 78,32 : : 14,7 

 would faturate 11,51 of foda. 



Laftly, In the 6th table I find that 100 grains deficcated foda 

 contains 60 of foda. Then if 100: 60 : : x. 1 1,51, theniPC^: 19,1 parts 

 deficcated foda. Then 19,1 parts deficcated foda will faturate the 

 acid contained in 50 parts cryftallized Epfom. 



Note I ft. This problem is of ufe in determining the quantity 

 &f any precipitating fubftances to be employed in decompofitions, 



Z 2 operated 



