RP1 - Making Salts

• What is the aim of the experiment described?

  Preparation of a pure, dry soluble salt
• What is used to heat the dilute acid in the experiment?

  Bunsen burner
• What type of acid is used in the preparation?

  1.0 M dilute sulfuric acid
• What insoluble base is used in the experiment?

  Copper (II) oxide powder
• What equipment is needed for the experiment?

  • 1.0 M dilute sulfuric acid
  • Copper (II) oxide powder
  • Spatula
  • Glass rod
  • Measuring cylinder
  • Two beakers (100 cm³ and 250 cm³)
  • Bunsen burner
  • Tripod
  • Gauze
  • Heatproof mat
  • Filter funnel and paper
  • Small conical flask
  • Evaporating basin
  • Crystallising dish
• What is the first step in the method of preparation?

  Measure 20 cm³ sulfuric acid
• Why is the acid heated gently?

  To avoid splattering and ensure safety
• What should be added to the acid during the reaction?

  Small amounts of copper oxide
• How do you know when to stop adding copper oxide?

  When no more effervescence is produced
• What is the purpose of filtering the solution?

  To remove excess copper oxide
• What is done after filtering the solution?

  Pour the solution into the evaporating basin
• How is the solution evaporated?

  Using a water bath
• What should be done after crystals start to form?

  Leave the basin in a cool place
• How long should the evaporating basin be left to cool?

  At least 24 hours
• What is the final step in preparing the salt?

  Gently pat the crystals dry
• What safety precautions should be taken during the experiment?

  • Wear safety goggles
  • Tie back hair
  • Turn off Bunsen burner when not in use
  • Use orange safety flame when necessary
• Why is it important to wear safety goggles?

  Because sulfuric acid is corrosive
• What should be done with the Bunsen burner when not in use?

  Turn it off or leave on safety flame