A `1.17%` solution of `NaCl` is isotonic with `7.2%` solution of glucose. Calculate the Van't Hoff factor of `NaCl`.

Explanation

To solve the problem, we need to find the Van't Hoff factor (i) for NaCl, given that a 1.17% solution of NaCl is isotonic with a 7.2% solution of glucose.

### Step-by-Step Solution:

1. **Understand the Concept of Isotonic Solutions:**
- Two solutions are isotonic when they have the same osmotic pressure. Therefore, the osmotic pressure of the NaCl solution will equal the osmotic pressure of the glucose solution.

2. **Define the Formula for Osmotic Pressure:**
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