# Questions tagged [vapor-pressure]

This is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. Apply this tag to questions involving clarification related to vapor pressure.

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### Why do azeotropes behave the way they do?

I read this answer to a similar question whilst it proved to be plenty insightful there was this one point I failed to understand: To get a minimum boiling azeotrope, the deviation from Raoult's Law ...
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### How do I create a highly conductive vapor cloud [closed]

I'm working on a project that requires that I create an electrically conductive gas cloud that can conduct voltages as low as 1.5v from a regular double A battery. I've been looking into using mecury ...
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### Total pressure of saturated solution of air and Benzene [closed]

The question asked for me is - A sample of air is saturated with benzene (vapour pressure =100 mm Hg at 298 K) at 298 K, 750 mm Hg pressure.If it is isothermally compressed to one third of its initial ...
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### Why do we have water vapor at room temperature and atmospheric pressure when water is a compressed liquid at these conditions?

At room temperature and 1 atm pressure liquid water should be a compressed liquid. Now if that is the case then why do we have water vapor at these conditions? I can't make sense of this based on just ...
1 vote
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### Vapor Pressure of Two Immiscible Liquids [duplicate]

The vapor pressure of two immiscible liquids (A and B) is the sum of their vapor pressures in their pure liquid form. Intuitively, I don't see how this is possible. If the liquids are being stirred ...
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1 vote
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### What is the exact definition of isotonic solutions?

Background of the Question I am a high school student so maybe my understanding of this topic is quite less, so apologies in case I have asked an elementary question. My chemistry sir taught that :- ...
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### How is lowering in vapour pressure a colligative property?

Imagine we have two containers: A and B. Both contain equal amounts of water and we add (say 50) molecules of sucrose and 50 molecules of glucose in containers A and B respectively. Now, the typical ...
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### Why doesn't vapour pressure depend upon the amount of liquid?

I was reading about the Clausius-Clapeyron Equation, which is as follows: I was also reading about Vapour Pressure, when I learned this: The vapor pressure of a liquid does not depend on the amount ...
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### Interpretation of a Phase Diagram

I am a bit confused about the correct way to interpret a phase diagram. I was told that the line separating the liquid and gas phases gives the vapor pressure of the liquid substance as a function of ...
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### Bubbling air through hydrochloric acid to generate HCl gas

I am trying to build a system to generate dry HCl gas. I was wondering if you bubble air through diluted HCl will it produce a gas with mostly water vapor or HCL vapor, can we vary the proportions of ...
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### Vapor / liquid balance in a closed container? [closed]

How is the vapor-liquid balance in a closed container computed as a function of temperature? In other words, if I have a container half full of water and I heat the container from 20-degrees C to 30-...
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### Why is the relationship between vapour pressure and boiling point of water non-linear?

From my rudimentary understanding of chemistry, pressure should be directly proportional to temperature for a constant mass of gas under the same volume (Charles’s law). However, in the diagram above,...
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### How does steam distillation work to extract a substance from a mixture, below its boiling point?

This is a small confusion I have regarding steam distillation. Let us consider a sample of water mixed with an organic compound that is insoluble in water. Let us also consider that the boiling point ...
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### Why is octane more volatile than water while having a higher boiling point?

Octane has a boiling point of 120 °C. Water has a boiling point of 100 °C. The definition of boiling point is, "the temperature which the liquid substance's saturated vapor pressure equals the ...
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### Vapour pressure and Raoults law [duplicate]

Suppose we take a binary ideal solution having components A and B .... let's say that their mole fraction is 1/3 and 2/3 respectively (for simplicity) Now ... We know that this solution will start ...
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### Safety of an organic solvent in a sealed pressure pot or vacuum chamber

I am trying to experiment and find ways I can reuse various types of thermoplastics at home for hobby use and have investigated various solubilities of them in solvents (room temp or otherwise) to ...
1 vote
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### THF-H2O mixture at 80°C? isn't THF supposed to evaporate completely?

I was running a synthesis of TiO2 nanoparticles starting from a aqueous solution of TiCl4 2THF 0.125M at 80°C. Through a different experiment it was detemined that the maximum reaction yield was 96% ...
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1 vote
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### Why don't P graphs contradict Raoult's law graphs?

Our teacher gave us the following question: 1 mole each of liquids A, B are mixed in a piston-type vessel and piston is moved slowly and isothermally. (PA0 = 75 torr and PB0 = 25 Torr) Find: (a) ...
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### Saturation of air within isolated system with water and ethanol

I am planning an experiment in an isolated system that contains two droplets. One droplet is water and the other one is a 40% ethanol-water mixture. The isolated compartment is filled with air at 20°C....
1 vote