Arrange the following ions `Na^(+) , Mg^(2+) , Al^(3+)` in increasing
extent of hydration

Explanation

To arrange the ions \( \text{Na}^+, \text{Mg}^{2+}, \text{Al}^{3+} \) in increasing extent of hydration, we need to consider two main factors: the charge of the ions and their ionic sizes. The extent of hydration is influenced by the charge density of the ions, which is the ratio of the charge to the size of the ion.

### Step-by-Step Solution:

1. **Identify the Charges and Sizes of the Ions**:
- \( \text{Na}^+ \): Charge = +1, relatively larger size.
- \( \text{Mg}^{2+} \): Charge = +2, smaller than \( \text{Na}^+ \).
- \( \text{Al}^{3+} \): Charge = +3, smallest size among the three.
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