Preparation of Copper Sulfate Crystals

This video tutorial demonstrates the preparation of dry copper sulfate crystals through the neutralization of sulfuric acid with copper oxide. The process involves measuring and heating sulfuric acid, adding excess copper oxide, filtering the mixture to remove unreacted copper oxide, and evaporating water to obtain pure crystals. Safety precautions, such as wearing goggles, are emphasized throughout the experiment.

What is the purpose of wearing goggles during the experiment?

• To look professional

• To enhance visibility

• To protect from heat

• To prevent acid from splashing into the eyes

Why is sulfuric acid heated gently before adding copper oxide?

• To make the acid less corrosive

• To speed up the reaction

• To evaporate the acid

• To change the color of the acid

What indicates that copper oxide has been added in excess?

• The solution becomes clear

• The solution turns green

• The solution starts boiling

• Black unreacted copper oxide is visible

What is the role of copper oxide in the experiment?

• It acts as an acid

• It acts as a solvent

• It acts as a base

• It acts as a catalyst

What happens to the copper oxide when it reacts with sulfuric acid?

• It remains unchanged

• It dissolves completely

• It forms a gas

• It forms a soluble salt

What is the purpose of filtering the mixture after the reaction?

• To remove excess water

• To separate unreacted copper oxide

• To cool down the solution

• To add more acid

What is the color of the copper sulfate solution after filtration?

• Yellow

• Blue

• Red

• Green

Why is gentle heating used during the evaporation process?

• To make the crystals larger

• To change the color of the crystals

• To speed up the evaporation

• To prevent the release of harmful gases

What is the final product of the experiment?

• Copper oxide

• Water

• Copper sulfate crystals

• Sulfuric acid

What is the main reason for using a steam bath during evaporation?

• To increase the temperature rapidly

• To prevent crystal decomposition

• To change the color of the solution

• To add moisture to the crystals