[ ^'88 ] 



j^pplicatloH. 



The fp. grav. 1,4995 at 63° would be (by the table of variatioa 

 * already feen) 1,4995 + ooioi X 3 = 1,5025, which fcarcely dif- 



fers from 1,5070, a tabular number, which denotes the acid con- 

 tents 68,39 — ^"^^ ^^ ^"^o §''S- o^ this acid liquor contain 68,39 "^^"^ 

 acid, 400 grs. contain 68,39 x 4 = 273,56, and when 200 grs. 

 of water were added, then 600 grs. contained 273,56, and confe- 

 : quently 100 grs. of the mixture contained 45,59, which indicates 

 / the tabular fp. grav. 1,3621, which at the temperature of 64" 



would be 1,3581. 



This denfity differs much from that found by Hahn, being -4^-, 

 but that the error proceeds from his not having allowed fuiEcient 

 time for the penetration of the water and acid, and from the lofs of 

 acid by the heat excited will be feen in the examination of the 2d 

 experiment. ^ 



Experiment zd. 



To the 600 grs. of the mixture of the laft experiment, whofe 

 fp.grav. was by him 1,3157, and at 60° would be 1,317, he added 

 200 grs. of water, and found the fp. grav. of this Lift mixture at 

 64°, 1,2561, which at 60° would be 1,2578, the^heat excited 

 amounted to 80°. 



Application. 



