11.1 Making Salts

• What is the process being demonstrated in the video?

  Preparation of dry copper sulfate crystals
• What type of reaction is involved in making copper sulfate?

  Neutralization of an acid with a base
• What acid is used in the preparation of copper sulfate?

  Sulfuric acid
• What base is used in the preparation of copper sulfate?

  Copper oxide
• Why is it important to wear goggles during the experiment?

  To protect eyes from strong acid
• How much sulfuric acid is measured for the reaction?

  40 centimeters cubed
• What is the purpose of gently heating the sulfuric acid?

  To speed up the reaction
• What is the role of copper oxide in the reaction?

  It acts as a solid base to neutralize the acid
• What indicates that the copper oxide has reacted with the sulfuric acid?

  The solution turns blue
• What does adding excess copper oxide ensure?

  All the acid is neutralized
• How can you tell that excess copper oxide has been added?

  Black unreacted copper oxide remains in the beaker
• Why is filtering necessary in this experiment?

  To remove unreacted copper oxide from the solution
• What is the appearance of the copper sulfate solution after filtering?

  Bright blue
• What is the next step after obtaining the copper sulfate solution?

  Evaporate the water to obtain dry crystals
• Why should the copper sulfate not be heated directly over a Bunsen burner?

  It can break down and release harmful gases
• How is the copper sulfate solution heated to evaporate the water?

  Using a steam bath method
• How long is the copper sulfate solution heated over the steam bath?

  About ten minutes
• What is the final product of the experiment?

  Pure dry copper sulfate crystals
• What is the last step in the preparation of copper sulfate crystals?

  Scraping the crystals out of the evaporating dish
• What are the steps to prepare dry copper sulfate crystals?

  1. Measure 40 cm³ of sulfuric acid.
  2. Heat the acid gently.
  3. Add excess copper oxide to the acid.
  4. Stir and observe the blue color indicating reaction.
  5. Filter out unreacted copper oxide.
  6. Evaporate the water from the copper sulfate solution using a steam bath.
  7. Scrape out the dry copper sulfate crystals.