Enter the mole fraction of the solvent and the vapor pressure of the solvent (Pa) into the calculator to determine the Saturation Pressure.
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Saturation Pressure Formula
The following formula is used to calculate the Saturation Pressure.
Psat = Xsolv * Psolv
- Where Psat is the Saturation Pressure (Pa)
- Xsolv is the mole fraction of the solvent
- Psolv is the vapor pressure of the solvent (Pa)
To calculate the saturation pressure, multiply the mole fraction of the solvent by the vapor pressure of the solvent.
How to Calculate Saturation Pressure?
The following two example problems outline how to calculate the Saturation Pressure.
Example Problem #1:
- First, determine the mole fraction of the solvent. In this example, the mole fraction of the solvent is given as .87.
- Next, determine the vapor pressure of the solvent (Pa). For this problem, the vapor pressure of the solvent (Pa) is given as 100.
- Finally, calculate the Saturation Pressure using the equation above:
Psat = Xsolv * Psolv
Inserting the values from above and solving the equation:
Psat = .87 * 100 = 87 (Pa)
FAQ
What is mole fraction and how is it calculated?
Mole fraction is a way of expressing the concentration of a component in a mixture. It is calculated as the number of moles of the component divided by the total number of moles of all components in the mixture. For a binary mixture, if you know the mole fraction of one component, you can subtract it from 1 to find the mole fraction of the other component.
Why is the vapor pressure of the solvent important in calculating saturation pressure?
The vapor pressure of the solvent is a crucial factor in calculating saturation pressure because it represents the pressure exerted by the solvent’s vapor when it is in equilibrium with its liquid at a given temperature. The saturation pressure depends on the vapor pressure of the solvent because it indicates how much of the solvent can exist in vapor form at a specific temperature.
How does temperature affect saturation pressure?
Temperature has a significant effect on saturation pressure. As temperature increases, the kinetic energy of the molecules in the solvent increases, which in turn increases the vapor pressure of the solvent. Consequently, the saturation pressure, which is directly proportional to the vapor pressure of the solvent, also increases with temperature.
