RP1

• What is the aim of the experiment RP1?

  To react a base with an acid and evaporate the water to make crystal salts
• What is the control variable in the RP1 experiment?

  The amount of sulphuric acid
• What is the independent variable in the RP1 experiment?

  The amount of copper oxide (excess)
• What is the dependent variable in the RP1 experiment?

  The amount of salt produced
• What equipment is used in the RP1 experiment?

  • 2 cm³ of sulphuric acid
  • Evaporation basin
  • Spatula
  • Measuring cylinder
  • Copper oxide (II) powder
  • 2 beakers (100 cm³ and 250 cm³)
  • Filter paper and funnel
  • Gauze
  • Tripod
  • Crystallising dish
  • Small conical flask
  • Glass rod
• Why is copper oxide used in excess in the RP1 experiment?

  To ensure all of the sulphuric acid reacts
• What safety precautions should be taken during the RP1 experiment?

  Wear goggles and tie hair back
• What should be done with the Bunsen burner when not in use?

  Turn it off or use an orange safety flame
• What is the first step in the RP1 experiment?

  Measure 20 cm³ of sulphuric acid into a measuring cylinder and pour it into a beaker
• Why is the acid gently heated in the RP1 experiment?

  To give particles more kinetic energy
• What should be done after adding the copper oxide to the sulphuric acid?

  React until no more effervescence occurs
• What is the purpose of filtering the copper oxide solution?

  To remove excess copper oxide
• What is the next step after pouring the solution into the evaporating basin?

  Gently evaporate the solution over a water bath
• How long should the evaporating basin be left in a cool place?

  At least 24 hours
• What should be done to the crystals after they form?

  Gently pat them dry between two pieces of filter paper
• What is the overall process of making salts in the RP1 experiment?

  1. Measure and pour sulphuric acid into a beaker.
  2. Heat the acid gently.
  3. Add copper oxide in excess until no effervescence.
  4. Filter to remove excess copper oxide.
  5. Pour the solution into an evaporating basin.
  6. Evaporate the solution over a water bath.
  7. Leave to cool for 24 hours.
  8. Pat crystals dry between filter paper.