A solution of acetone in ethnol

Options

A. Shows a negative deviation from Raoult's law
B. Shows a positive deviation from Raoult's law
C. Behaves like a near ideal solution
D. Obeys Raoult's law

Answer

To solve the question regarding the behavior of a solution of acetone in ethanol, we need to analyze the properties of the solution in relation to Raoult's law.

### Step-by-Step Solution:

1. **Understanding Raoult's Law**:
Raoult's law states that the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent in the solution. For an ideal solution, the total vapor pressure is equal to the sum of the partial vapor pressures of each component.

2. **Identifying the Components**:
In this case, we have two components: acetone and ethanol. We need to determine how these two components interact when mixed.

3. **Evaluating Deviations from Raoult's Law**:
- **Negative Deviation**: This occurs when the total vapor pressure of the solution is less than expected. This typically happens when the interactions between different molecules are stronger than those in the pure components.
- **Positive Deviation**: This occurs when the total vapor pressure of the solution is greater than expected. This typically happens when the interactions between different molecules are weaker than those in the pure components.

4. **Analyzing Acetone and Ethanol**:
Acetone and ethanol have different polarities and hydrogen bonding capabilities. When mixed, the interactions between acetone and ethanol molecules are weaker than the interactions between the molecules of each pure component. This leads to an increase in vapor pressure.

5. **Conclusion**:
Since the solution of acetone in ethanol exhibits a higher total vapor pressure than predicted by Raoult's law, it shows a positive deviation from Raoult's law.

### Final Answer:
The solution of acetone in ethanol **shows a positive deviation from Raoult's law**.