P1 soluble salts

• What is the main topic of the video?

  Making a soluble salt using an acid
• What is a required practical in the context of this video?

  A practical likely to appear on exams
• What positive ion is found in copper sulfate?

  The metal ion cu$^{2+}$
• From which four sources can the metal ion in salts come?

  Metal, metal oxide, metal hydroxide, metal carbonate
• Why can't copper sulfate be made by reacting copper with dilute sulfuric acid?

  Copper is not reactive enough
• What negative ion is present in copper sulfate?

  The sulfate ion $SO_4^{2-}$
• What acid is used to make copper sulfate?

  Sulfuric acid
• What is the first step in making pure crystals of a soluble salt?

  Start with dilute sulfuric acid
• Why is dilute sulfuric acid considered the limiting reactant?

  It will run out before other reactants
• What happens if acid remains after the reaction?

  It would contaminate the salt
• What should be done to the acid before adding copper oxide?

  Gently heat it until almost boiling
• What color indicates the formation of copper sulfate in the solution?

  Blue
• When should you stop adding copper oxide to the acid?

  When the solution is clear blue
• What equipment is used to filter out unreacted copper oxide?

  Filter funnel and filter paper
• What is the purpose of evaporation in this process?

  To make crystals of copper sulfate
• How long should the solution be left to form crystals?

  24 hours
• What should be done to the copper sulfate crystals after formation?

  Pat them dry with a paper towel
• What is the final product of the described process?

  Pure dry crystals of copper sulfate
• What are the steps to make a soluble salt using an acid?

  1. Start with dilute sulfuric acid.
  2. Gently heat the acid.
  3. Add copper oxide until the solution is blue.
  4. Filter out unreacted copper oxide.
  5. Evaporate the solution to form crystals.
  6. Dry the crystals with a paper towel.
• What are the differences between using a metal oxide and a metal carbonate in making salts?

  • Both can react with acids to form salts.
  • Metal oxides produce water and a salt.
  • Metal carbonates produce carbon dioxide, water, and a salt.