Making Salt Crystals

• What is the aim of the procedure described?

  Obtain dry crystals of copper sulphate
• What is mixed with heated acid to start the reaction?

  Powdered copper oxide
• What type of acid is used in the reaction?

  Concentrated sulphuric acid
• What type of reaction occurs when mixing the base and acid?

  Neutralisation reaction
• What solution is produced from the neutralisation reaction?

  Copper sulphate solution
• How is excess copper oxide indicated in the mixture?

  By unreacted powder at the bottom
• What is the next step after adding excess copper oxide?

  Filter the mixture
• What is used to heat the solution during evaporation?

  A Bunsen burner over a tripod
• What is the purpose of the evaporating basin?

  To heat the solution
• What happens to the water during the heating process?

  It evaporates
• What should be done after the water has evaporated?

  Dry the crystals on filter paper
• What are the steps to obtain dry crystals of copper sulphate?

  1. Mix powdered copper oxide with heated concentrated sulphuric acid.
  2. Allow excess copper oxide to settle.
  3. Filter the mixture.
  4. Heat the copper sulphate solution in an evaporating basin.
  5. Dry the resulting crystals on filter paper.