Help can anyone answer my question

[alnywk]

help!can anyone answer my question!

it is the experiment that i did in school!~
topic:boiling point with composition for different mixtures of two miscibe liquids


first: mixing trichloromethane and ethyl ethanoate
so the following is the result~
Volume of trichloromethane/cm3
10 10 10 10 5 2 0
Volume of ethyl ethanoate/cm3
0 2 5 10 10 10 10
Volume % of ethyl ethanoate
Boiling point/0C
60 65 70 68 67 66 63








by plotting boiling point against volume %of ethyl ethanoate . we can see the curve rise but after drop , so why this happen !~??/
can anyone explain in detail ?
help me please!~

 

[alnywk]

another

the boiling point of mixing hexane and propanone just opposite .
it's curve drop but rise slightly .
why ?
Volume of trichloromethane/cm3
10 10 10 10 5 2 0
Volume of ethyl ethanoate/cm3
0 2 5 10 10 10 10
Volume % of ethyl ethanoate
Boiling point/0C
67 52 49 54 52 57 59

 

[GCT]

It all depends on the type of solution, whether it is an ideal solution, non-ideal solution etc...this pertains to the attraction characteristics between the two components.

If it is a ideal solution, then the mixtures will exhibit boiling point elevation with the higher boiling points exhibited by the mixture rather the the individual pure solutions (this is what you have with the trichloromethane and ethyl ethanoate), quite different for the vice versa situation.

I'll try to explain it in more detail if you're still wondering about it.