Making salts

• What is the process being demonstrated in the video?

  Preparing a dry salt from an acid and base
• What type of acid is used in the experiment?

  Sulfuric acid
• What is the base used in the experiment?

  Copper oxide
• What salt is produced from the reaction?

  Copper sulfate
• How much sulfuric acid is measured for the reaction?

  40 centimeters cubed
• Why is it important to wear goggles during the experiment?

  To protect eyes from strong acid
• What is done to speed up the reaction?

  Gently heating the sulfuric acid
• What does adding an excess of copper oxide ensure?

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

  Black unreacted copper oxide remains
• What method is used to remove unreacted copper oxide?

  Filtration
• What color is the copper sulfate solution?

  Bright blue
• Why do we need to evaporate the water from the copper sulfate solution?

  To obtain pure dry crystals
• What is the risk of heating copper sulfate crystals too much?

  They break down and release gases
• How is the copper sulfate solution heated during evaporation?

  Using a steam bath method
• What is the final step after evaporating the water?

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

  1. Measure sulfuric acid (40 cm³).
  2. Heat gently to speed up reaction.
  3. Add excess copper oxide to neutralize acid.
  4. Filter out unreacted copper oxide.
  5. Evaporate water from copper sulfate solution.
  6. Scrape out dry copper sulfate crystals.