100 mL of liquid A and 25 mL of liquid B are mixed to formal solution of volume 125 mL. Then the solution is ideal or not .

Explanation

To determine whether the solution formed by mixing 100 mL of liquid A and 25 mL of liquid B is ideal or not, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Initial Volumes**:
- Volume of liquid A = 100 mL
- Volume of liquid B = 25 mL

2. **Calculate the Total Initial Volume**:
- Total initial volume = Volume of A + Volume of B
- Total initial volume = 100 mL + 25 mL = 125 mL

3. **Mixing the Liquids**:
- When liquids A and B are mixed, we observe the final volume of the solution.

4. **Determine the Final Volume**:
- According to the question, the final volume of the solution after mixing is also 125 mL.

5. **Calculate the Change in Volume (ΔV)**:
- Change in volume (ΔV) = Final Volume - Initial Volume
- ΔV = 125 mL - 125 mL = 0 mL

6. **Analyze the Result**:
- In ideal solutions, the change in volume upon mixing is zero (ΔV = 0).
- Since we found that ΔV = 0, this indicates that the solution behaves ideally.

7. **Conclusion**:
- Therefore, the solution formed by mixing 100 mL of liquid A and 25 mL of liquid B is an ideal solution.

### Final Answer:
The solution is ideal.

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