Materials:

* Calcium oxide (CaO) - quicklime: This is the main ingredient. It's a white, powdery substance.

* Distilled water: Use distilled water to avoid impurities that could affect the reaction.

* Beakers: For mixing and storing the lime water.

* Funnel: For filtering the lime water.

* Filter paper: For separating undissolved solids.

* Stirring rod: For mixing the solution.

Procedure:

1. Safety Precautions:

* Wear safety goggles and gloves to protect your eyes and skin.

* Calcium oxide reacts exothermically with water, releasing heat. Handle it with care.

* Work in a well-ventilated area to avoid inhaling dust.

2. Prepare the Lime Solution:

* In a clean beaker, add a small amount of calcium oxide (quicklime) to distilled water.

* Start with a small amount of quicklime (approximately 1-2 grams) and gradually add more if needed.

* Use a small amount of water (around 50-100 ml) and stir thoroughly.

* The reaction will produce heat and cause the water to become cloudy.

* Continue stirring until the solution becomes clear or nearly clear.

3. Filter the Solution:

* Use a funnel lined with filter paper to filter the solution. This will remove any undissolved calcium oxide.

4. Store the Lime Water:

* Store the filtered lime water in a clean, airtight container.

* Label the container with the date and "Lime Water."

Explanation:

* Calcium oxide (CaO) reacts with water (H2O) to form calcium hydroxide (Ca(OH)2), which is commonly known as lime water:

* CaO + H2O → Ca(OH)2

* Calcium hydroxide is a weak base. It's a clear, colorless solution that turns milky white when exposed to carbon dioxide in the air.

Key Points:

* Lime water is unstable. It will absorb carbon dioxide from the air and form calcium carbonate (CaCO3), turning milky.

* Excess quicklime can lead to a very concentrated lime water. This can be harmful if ingested or if it comes into contact with skin.

* Use lime water freshly prepared whenever possible.

Uses of Lime Water in the Laboratory:

* Testing for carbon dioxide (CO2): Lime water turns milky white in the presence of carbon dioxide gas. This is used in experiments to demonstrate the production of CO2.

* Neutralizing acids: Lime water can be used to neutralize weak acids.

* Preparing other calcium compounds: Lime water is a starting material for making other calcium-containing compounds.

Let me know if you have any other questions!