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decompofition T effc<fled by tartariii, but the exact feparation of 

 the foda from the fylvian was fo difficult that 1 defpaiicd of ob- 

 taining fatisfadlion in that w y : luckily, however, a more patient 

 and fkilful experimenter, Mr. Hahneman has fince performed this 

 experiment, and found that 1 1 parts mere tartarin were requi'^te 

 to feparate 7 of 7nere foda from common fait.* We may the be- 

 fore now examine with which of the two opposite ftatements this 

 proportion is be ft fuited. 



By my determination 7 grains foda enter into the compofition 

 of 13,21 of common fait, and this cjuantity _of common fait 

 contains alfo 5,13 grains real acid, which muft be taken up by 

 the tartarin to fet the 7 grains of foda free. Now fnce 100 parts 

 tartarin take up 56,3 of real marine acid, 9,12 of tartarin fliould 

 take up 5,12 of this acid, which falls fliort of Hahneman's refult 

 by 1.88 grains. But it is well known that fomewhat more of 

 any divellent iigent muft be applied to effed an intire ftporatioT} of 

 any principle than would be neceflary to faturate that principle 

 if it were in a -free difengaged fta.te. 



By Bergman's determination 7 grains of foda enter into the 

 compofition of 16,66 of common fait, and this quantity of 

 common fait contains alfo 8 o^ real marine acid, now, as ac- 

 cording to him 100 parts tartarin take. up 51,5 of the ftronget. or 

 real marine acid, 15,53 would be requifite to take up 8 o<" that 

 acid, which exceeds Hahneman's refult by 4,53 grains, whereas 

 by the above reafon it fliould rather fall fliort of it. 



Vol. VII. li But 



* 2 Chy. An. 1797, p. 395. 



