Preparing Copper Sulphate:
To prepare copper sulphate, follow these steps:

1. Gather the Materials:
- Copper oxide or copper carbonate
- Dilute sulfuric acid (H2SO4)
- Distilled water
- Beaker or glass container
- Stirring rod
- Filter paper
- Funnel

2. Preparing the Copper Solution:
- Start by adding a small amount of copper oxide or copper carbonate into a beaker or glass container.
- Slowly add dilute sulfuric acid to the copper oxide or carbonate while stirring continuously until the reaction stops.
- Keep adding the acid until no more reaction occurs, indicating that all the copper oxide or carbonate has dissolved.

3. Purifying the Solution:
- Filter the solution using filter paper and a funnel to remove any impurities or undissolved particles.
- Collect the filtrate in a separate container, which should now contain a blue solution of copper sulphate.

4. Crystallizing Copper Sulphate:
- Pour the blue solution into an evaporating dish or shallow container.
- Allow the solution to evaporate slowly at room temperature, or you can speed up the process by gently heating the solution.
- As the water evaporates, blue crystals of copper sulphate will start forming.
- Once the solution has completely evaporated, collect the crystals and let them dry. You now have copper sulphate.

Preparing Caustic Soda:
To prepare caustic soda, also known as sodium hydroxide, follow these steps:

1. Gather the Materials:
- Sodium chloride (table salt)
- Water
- Electrolysis apparatus
- Graphite electrodes
- Power source (battery or electric supply)
- Beaker or glass container

2. Electrolysis of Sodium Chloride:
- Dissolve sodium chloride in water to create a saltwater solution.
- Set up the electrolysis apparatus by placing two graphite electrodes into the solution.
- Connect the electrodes to a power source, ensuring that the positive electrode (anode) is connected to the positive terminal and the negative electrode (cathode) to the negative terminal.
- Turn on the power source, and electrolysis will occur.
- The chlorine gas will be produced at the anode, while hydrogen gas and sodium hydroxide will be produced at the cathode.

3. Collecting Caustic Soda:
- The sodium hydroxide, or caustic soda, will be present in the solution surrounding the cathode.
- Carefully remove the solution from the electrolysis apparatus and transfer it to a separate container.
- The solution now contains caustic soda, which can be used for various purposes.

Preparing Iodine:
To prepare iodine, follow these steps:

1. Gather the Materials:
- Potassium iodide
- Hydrochloric acid (HCl)
- Hydrogen peroxide (H2O2)
- Glass container
- Filter paper
- Funnel

2. Preparing the Iodine Solution:
-