A binary solution of ethanol and n-heptane is an example of

Options

A. Ideal solution
B. Non ideal solution with positive deviation
C. Nonideal solution with negative deviation
D. Unpredictable behaviour

Answer

To solve the question regarding the binary solution of ethanol and n-heptane, we need to analyze the nature of the solution and its behavior according to Raoult's Law. Here’s a step-by-step breakdown of the solution:

### Step 1: Understanding the Components
- **Identify the components of the solution**: The binary solution consists of two components: ethanol (A) and n-heptane (B).

**Hint**: Recognize the components of the solution and their properties.

### Step 2: Intermolecular Forces
- **Analyze the intermolecular attractions**: In a solution, the intermolecular forces between like molecules (ethanol-ethanol and n-heptane-n-heptane) are generally stronger than the intermolecular forces between unlike molecules (ethanol-n-heptane).

**Hint**: Compare the strength of intermolecular forces between similar and dissimilar molecules.

### Step 3: Raoult's Law
- **Apply Raoult's Law**: According to Raoult's Law, the vapor pressure of a solution is determined by the vapor pressures of the individual components and their mole fractions. For an ideal solution, the vapor pressure of the solution should equal the sum of the partial pressures of the components.

**Hint**: Recall that Raoult's Law states that the total vapor pressure of a solution is the sum of the partial vapor pressures of its components.

### Step 4: Deviations from Raoult's Law
- **Determine the type of deviation**: Since the intermolecular forces between the components (ethanol and n-heptane) are weaker than those between the pure components, the vapor pressure of the solution will be higher than predicted by Raoult's Law. This indicates a positive deviation.

**Hint**: Understand that a positive deviation occurs when the vapor pressure of the solution is greater than expected.

### Step 5: Conclusion
- **Identify the nature of the solution**: Based on the analysis, the binary solution of ethanol and n-heptane is classified as a non-ideal solution with positive deviation from Raoult's Law.

**Hint**: Summarize the findings to conclude the type of solution.

### Final Answer
The binary solution of ethanol and n-heptane is an example of a **non-ideal solution with positive deviation** from Raoult's Law.