# What is Raoult’s Law explain with example?

What is Raoult’s Law explain with example? The Raoult’s law states that a solvent’s partial vapour pressure in a solution or mixture is equal to the vapour pressure of a pure solvent multiplied by its mole fraction in the solution.

Is Raoult’s Law a gas law? Raoult’s law is akin to the ideal gas law, except as it relates to the properties of a solution. The ideal gas law assumes ideal behavior in which the intermolecular forces between dissimilar molecules equals forces between similar molecules.

What is Raoult’s second law? Raoult’s Second law states that. A decrease in crystallization temperature of infinitely dilute solutions does not depend on the solute’s nature and directly proportional to the molal concentration of the solution.

What is Raoult’s Law for ideal solution? Ans: Raoult’s law states that the solution’s vapour pressure is equal to the sum of each volatile component’s vapour pressure if it was strictly multiplied by the mole fraction of that component in the solution.

## What is Raoult’s Law explain with example? – Additional Questions

### What is the importance of Raoult’s Law?

Raoult’s law is especially useful since it explains ideal solutions, which are ones in which the gas phase has thermodynamic properties that are similar to a combination of ideal gases. The only problem is that they are rare and difficult to come by.

### How do you derive Raoult’s Law?

Derivation of Raoult’s Law
1. Derivation of Raoult’s Law.
2. p = K [N / (n + N)] = K xN
3. Raoult’s law states: The vapor pressure of an ideal solution is dependent on the vapor pressure of each chemical component and the mole fraction of the component present in the solution.
4. Understanding Raoult’s law –

### What is Raoult’s Law prove mathematically?

Raoult’s law – The vapour pressure of a solution of a non-volatile solute is equal to the vapour pressure of the pure solvent at that temperature multiplied by its mole fraction. Mathematically, Raoult’s law equation is written as; Psolution=P0solventXsolvent.

### What is Raoult’s Law and its limitations?

Raoult’s Law states that “For a solution containing non volatile solute, at a given temperature, the relative lowering of vapour pressure is equal to mole fraction of the solute. i. e. p’/p=x. Limitations : 1. Raoult’s law is applicable only to very dilute solutions.

### What is positive deviation from Raoult’s Law?

Positive deviation from Raoult’s law means when the vapour pressure is higher than the solution is expected to exhibit. An example of positive deviation from Raoult’s law is the mixture of acetone and ethanol.

### Why is negative deviation Raoult’s Law?

<br> The reason for the negative deviation from Raoult. s law is that the intermolecular attractive forces between A-A & B-B are weaker than those between A-B and leads to decrease in vapour pressure.

### What is negative deviation?

Negative deviation ‘When the vapour pressure of a solution is lower n the predicted value Raoult’s law, it is called negative deviation.’ In ase of negative deviation the intermolecular attractive forces between A – A and B – B are weaker than those between A – B.

### Which shows negative deviation from Raoult’s Law?

Acetone and chloroform will show a negative deviation due to their association after mixing.

### What is positive and negative deviation?

A positive deviation indicates that the vapour pressure above the solution is higher than expected. A negative divergence, on the other hand, indicates that the solution’s vapour pressure is lower than expected.

### Which solutions show positive deviation?

Solution : Acetone + ethanol is an example of solutions showing positive deviation from Raoult’s law .

### Why is positive deviation endothermic?

In case of positive deviation, A-B interactions are weaker than A-A, B-B interaction. Hence energy is required to break the latter bonds. Therefore it absorbs energy from surrounding , in the form of heat making it an endothermic reaction.

### Why is negative deviation exothermic?

ΔmixH is negative because energy is released due to increase in attractive forces. Hence exothermic process.

### What is non-ideal solution?

A non-ideal solution is a solution that does not abide to the rules of an ideal solution where the interactions between the molecules are identical (or very close) to the interactions between molecules of different components.

### Why does volume increase in positive deviation?

The lessened attraction between the constituents effectively means that the average “intermolecular distance” would be greater after mixing than it was before, hence the increased volume.

### What is difference between ideal and non ideal solutions?

The solution which obey Raoult’s law over the entire range of concentration are known as ideal solutions. When a solution does not obey Raoults’s law it is called as non-ideal solution.

### What happens to volume in negative deviation?

On mixing liquid X and liquid Y, the volume of the resulting solution decreases means it is Negative deviation of Raoult’s law. There is an elevation of boiling point occurs i. e., the temperature of the solution increase it means δH=−ve.

### How do you identify positive and negative deviations from Raoult’s Law?

A positive deviation in Raoult’s law is due to the hydrogen bonding in-between the molecules. These hydrogen bonds increase the attraction between the molecules in solution. Hence, vapour pressure of the solution is greater than the calculation. In negative deviation, the attraction in-between the molecule is reduced.