- #1
Brwahussen
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I know that non volatile impurities increases the boiling point of a liquid.
Does volatile impurity decreases the boiling point? How?
Does volatile impurity decreases the boiling point? How?
How volatile impurity affects boiling point of a liquid?
- Thread starter Brwahussen
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In summary, the presence of impurities in a liquid increases its boiling point due to the decrease in vapor pressure caused by the blocking of molecules from transitioning to a gaseous state. This results in the need for more energy to elevate the vapor pressure to the environment pressure. Similarly, the presence of volatile impurities can also cause a higher vapor pressure, as it vaporizes on its own. This can be explained using Raoult's law and shows that a higher temperature is required for the partial pressure of the solvent to equal the external pressure. It is important to note that while the concept is related to energy, it is more accurately described in terms of temperature.
- #2
Borek
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In general more volatile things boil first, don't they?
What is the definition of the boiling point? Why does the presence of non-volatile impurity increase the BP temperature? (hint: Raoult's law). Can you extend this line of thinking?
What is the definition of the boiling point? Why does the presence of non-volatile impurity increase the BP temperature? (hint: Raoult's law). Can you extend this line of thinking?
- #3
Brwahussen
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Because the presence of impurities will block more molecules to jump to gaseous state so the vapore pressure will decrease, hence more energy is needed to elevate vapore pressure to environment pressure and higher boiling point is resulted.Borek said:
So, does presense of volatile impurity will cause higher vapore pressure? Because it vaporizes it by itself
[sorry if my English is bad]
- #4
Borek
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Brwahussen said:
OK
It is not exactly about energy (although in a way you are right, you need energy to heat up the mixture), more like you need a higher temperature so that the partial pressure of the solvent becomes equal to the external pressure. But in general you are on the right track. Note that is pretty easy to show using Raoult's law (try!).
Yes.
Actually it is not just bad, it is atrocious
But everyone has to start somewhere.- #5
Brwahussen
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Thanks!Borek said:OK
It is not exactly about energy (although in a way you are right, you need energy to heat up the mixture), more like you need a higher temperature so that the partial pressure of the solvent becomes equal to the external pressure. But in general you are on the right track. Note that is pretty easy to show using Raoult's law (try!).
Yes.
Actually it is not just bad, it is atrocious
:)
And I will keep improving my english ;).
- #6
Borek
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Brwahussen said:
Popracuj popracuj, warto.
What is a volatile impurity?
A volatile impurity is a substance that can easily evaporate or vaporize at room temperature. It is typically a liquid or gas that has a low boiling point.
How does a volatile impurity affect the boiling point of a liquid?
A volatile impurity can lower the boiling point of a liquid. This is because the impurity molecules can mix with the liquid molecules, making it easier for the liquid to overcome the intermolecular forces and turn into a gas.
Can a volatile impurity also increase the boiling point of a liquid?
No, a volatile impurity can only lower the boiling point of a liquid. This is because the impurity molecules do not have strong intermolecular forces and therefore do not contribute to the boiling point of the liquid.
How does the concentration of a volatile impurity affect the boiling point of a liquid?
The higher the concentration of a volatile impurity, the lower the boiling point of the liquid will be. This is because there are more impurity molecules present to disrupt the intermolecular forces of the liquid molecules.
Can a volatile impurity affect the boiling point of all liquids?
Yes, a volatile impurity can affect the boiling point of all liquids. However, the magnitude of the effect may vary depending on the strength of the intermolecular forces in the liquid and the concentration of the impurity.
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