Lowering Of Vapour Pressure
Lowering of vapour pressure is the ratio of vapour pressure of the solution to the vapour pressure of the pure solvent. If we add any non-volatile solute to the solvent we can easily lower the vapour pressure of the solution. the image added below shows the relative lowering of the vapour pressure of any solution.
Suppose if Po is the vapour of the pure solvent and Ps is the vapour pressure of the solvent then relative lower of the vapour pressure is calculated by taking the ratio of (Po – Ps) and Po. i.e.
Relative Lowering of Vapour Pressure = (Po – Ps)/Po
The relative lowering of the vapour pressure of a solution having non-volatile solutes is equal to the mole fraction of the solute. If n is the number of moles of the solute and N is the number of moles of the solvent. Then we can say that,
(Po – Ps)/Po = n/(n + N)
Colligative Properties
Colligative Properties of any solution is the property of the solution that depends on the ratio of the total number of solute particles and the total number of solvent particles. Changing the moles or number of particles of solute or solvent changes the colligative properties of the solution. These colligative properties are not dependent on the chemical nature of the solute or solvent but are rather dependent on the number of solutes and solvent particles in the solution. These colligative properties depend on the number of particles in the solution rather than the nature of the solute and the solvent. These properties can be easily linked with the concentration of the solution, i.e. Molarity, Normality, and Molality.
In this article, we will learn about, various types of Colligative properties of the solution, their examples, and others in detail.
Table of Content
- What are Colligative Properties?
- Colligative Properties Examples
- Types of Colligative Properties
- Lowering Of Vapour Pressure
- Elevation in Boiling Point (ΔTb)
- Depression in Freezing Point (ΔTf)
- Osmotic Pressure (π)
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