Termodynamics: saturation pressure vs total air pressure

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Discussion Overview

The discussion revolves around the calculation of pressure in a closed system containing air and chloroform, specifically focusing on the relationship between saturated pressure and total air pressure. Participants explore the implications of saturation pressure in the context of a gas mixture and its dependence on temperature.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant, Tadej, questions whether the end pressure of the gas mixture can be calculated simply by adding the chloroform saturated pressure to the starting air pressure, or if the change in total pressure affects the saturated pressure.
  • Another participant, Chet, asserts that it is indeed as simple as adding the chloroform vapor pressure to the starting air pressure.
  • Tadej later inquires about calculating saturated pressure in relation to atmospheric pressure, noting that it varies for water vapor.
  • A participant mentions that saturation pressure is a function of temperature and can be referenced from a table.
  • Tadej expresses a misconception regarding the dependence of chloroform's saturated pressure on the total pressure of the mixture, clarifying that the pressure in the liquid equals that in the vapor.

Areas of Agreement / Disagreement

There is a disagreement regarding the initial question of whether the end pressure can be calculated simply by adding pressures. While one participant agrees with this approach, Tadej's follow-up questions indicate uncertainty about the relationship between saturated pressure and total pressure.

Contextual Notes

Participants discuss the dependence of saturation pressure on temperature and the potential misconceptions about how it relates to total pressure in a gas mixture.

Who May Find This Useful

This discussion may be useful for individuals interested in thermodynamics, particularly those exploring concepts related to pressure in gas-liquid mixtures and saturation phenomena.

Tadej
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Hi!

I have a question.
The experiment goes like this. i hermetically close air and chloroform at standard pressure. now i want to calculate the end pressure of gas mixture after chloroform vapor gets saturated.

is it as simple as adding up the chloroform saturated pressure to the starting air pressure?
or do i have to take into account a change in the saturated pressure because of the change in the total pressure?

general direction and some formulas will be very appreciated :)

thank u
Tadej
 
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Yes, it's as simple as adding the chloroform vapor pressure to the starting air pressure.

Chet
 
great! tnx :)

what about calculating the saturated pressure regarding a certain atmospheric pressure? i know it varies considerably for water vapor...

thank u
Tadej
 
Saturation pressure is a function of temperature and is read from a table.
 
Tadej said:
great! tnx :)

what about calculating the saturated pressure regarding a certain atmospheric pressure? i know it varies considerably for water vapor...

thank u
Tadej
I don't understand your question.
 
its just a product of my misconception :)

i thought that saturated pressure of chloroform varies with the total pressure of the air+chloroform mixture. and of course it doesnt, because there is same pressure in the liquid as in the vapor.

thank u :)
 

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