What is osmotic pressure ? Why it is a colligative property ?

Explanation

### Step-by-Step Text Solution

**Step 1: Define Osmotic Pressure**
Osmotic pressure is defined as the minimum excess pressure that must be applied to a solution to prevent the flow of solvent into it through a semi-permeable membrane. This phenomenon occurs when a solvent moves from a region of lower solute concentration to a region of higher solute concentration in order to equalize the concentrations on both sides of the membrane.

**Step 2: Explain the Formula for Osmotic Pressure**
The osmotic pressure (π) can be mathematically expressed using the formula:
\[
...