titration

• 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 does every salt contain?

  A positive ion and a negative ion
• What is the positive ion in copper sulfate?

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

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

  Copper is not reactive enough
• What are the four sources of metal ions mentioned?

  Metal, metal oxide, metal hydroxide, metal carbonate
• What is the negative ion 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 first in the reaction
• 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 is the purpose of stirring the solution after adding copper oxide?

  To ensure the copper oxide reacts completely
• What color indicates the formation of copper sulfate in the solution?

  Blue
• What should you do if the solution remains clear blue?

  Stop adding copper oxide
• What is done with unreacted copper oxide after the reaction?

  It is filtered away
• What equipment is used to filter the unreacted copper oxide?

  Filter funnel and filter paper
• What is the next step after filtering the solution?

  Evaporate the solution to form crystals
• How is the copper sulfate solution heated for evaporation?

  Gently over boiling water
• What should be done when half the solution remains during evaporation?

  Leave it for 24 hours to form crystals
• How are the copper sulfate crystals dried after formation?

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

  Pure dry crystals of copper sulfate
• Where can students find more questions on this practical?

  In the vision workbook
• 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 and stir until blue.
  4. Filter out unreacted copper oxide.
  5. Evaporate the solution to form crystals.
  6. Dry the crystals with a paper towel.