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Chemistry. — “Saline solutions with two boiling points and 
phenomena connected therewith.’ By Prof. H. W. BAkKHuIs 
ROOZEBOOM. 
(Communicated in the meeting of December 28, 1901.) 
The present communication is connected with my researches on 
the vapour pressure curves of saturated solutions which were com- 
pleted as far back as 1889. These researches related to systems in 
which gases and water, water and salts, or ammonia and salts were 
the components. They led to the result that in all cases the vapour 
pressure curves of saturated solutions, that is of solutions which 
are in contact with a solid phase, have a similar course, it being 
immaterial whether the solid phase is one of the two components 
or a combination of them. In the case of water and salt we start 
at lower temperatures with less concentrated solutions. Generally 
the concentration of the saturated solution increases on raising the 
temperature, so that in the ideal case we finally arrive at the 
melting point of the salt which forms the solid phase, which may 
be either a hydrated or anhydrous salt. In all cases in which 
that melting point is attainable, the vapour pressure curve shows 
the form indicated in the annexed figure A B C, from which it 
“el 
me ss a csi wm esl rm ete a ere wm ee 
Aden 
Cc! 
if Z 
is seen that the vapour pressure of the saturated solution increases 
first from A to B, reaches a maximum in B and then decreases 
from B to the melting point, C, of the salt. 
In order to indicate the increasing concentration of the solution 
