The aqueous solution of calcium hydroxide (Ca(OH)₂) becomes blurred when you send carbon dioxide (CO₂) into it because of a chemical reaction that forms a precipitate. Here's why:

1. Calcium Hydroxide (Limewater):

* Calcium hydroxide is a weak base and its aqueous solution is known as limewater.

* Limewater is clear and colorless.

2. Reaction with Carbon Dioxide:

* When carbon dioxide gas is bubbled through limewater, it reacts with the calcium hydroxide to form calcium carbonate (CaCO₃) and water (H₂O).

* The chemical equation for this reaction is:

```

Ca(OH)₂ (aq) + CO₂ (g) → CaCO₃ (s) + H₂O (l)

```

3. Formation of the Precipitate:

* Calcium carbonate (CaCO₃) is an insoluble white solid. This means it doesn't dissolve well in water.

* As the reaction progresses, the insoluble calcium carbonate precipitates out of the solution, forming a milky-white suspension.

4. Blurred Appearance:

* The suspension of tiny calcium carbonate particles scatters light in all directions, making the solution appear cloudy or blurred.

In Summary:

The carbon dioxide reacts with the calcium hydroxide, producing a white precipitate of calcium carbonate. This precipitate makes the solution cloudy and opaque, leading to the blurred appearance.