gg J. sAKURAi: Modification of ëeokmann's boiling 



dp _ n 



or, as 100 grams of the solvent is employed, and M is its molecular 

 weight, ^ve have - . 



ch) M 



— n. 



P 100 



Equating this value of — ^ with that already obtained, we have 



1 



n. M CO. clT . 



100 ~ 2r2 ' 



In this equation, o) being the latent heat of vaporization of a gram- 

 molecule of the solvent {M grams) in grani-calori, it follows that 

 -^= latent heat of vaporization of one gram of the solvent. Calling 

 this IK, we liave 



n. M M. W. dT 



100 '2r- 



02 r^ 



or dT^^ny. — ^^^ — 



If s= weiirht of the substance dissolved in 100 orams of the solvent 

 and m= molecular weig-ht of the dissolved substance, then n=^—' 

 Substituting this value of n in the above equation and solving for ///, 

 we have 



.0-2I- .«? 



7)1- 



W clT 



In this equation, s nnd dT have the same meaning as (j and A 



respectively in one of the preceediug equations, and the constant, 



02 r- 

 ^ > for ether is found to be equal to 



.02 X (273 + 84.97)- _,-,, 

 yo.l ~^ ' 



the value which we already obtained for B' in the same equation. 



Now, turning to the practical side of the question, the great and 



