RP08 - Water Purification

• What is the first step to test the pH of water?

  Use universal indicator paper or pH probe
• What is the expected pH of pure water?

  pH 7
• What color does pure water show on universal indicator paper?

  Green
• How can you find the mass of salt in water?

  Weigh evaporating basin, heat, reweigh
• What are the steps to find the mass of salt dissolved in water?

  • Weigh an empty evaporating basin
  • Fill with water sample and heat
  • Reweigh the basin to find mass of salt
• What method can be used to purify water?

  Distillation
• Describe the distillation process for purifying water.

  1. Test pH and adjust to 7
  2. Heat water in a conical flask
  3. Steam enters condenser, cools, and collects
• How can you test if distilled water is pure?

  Check pH is 7 and boiling point is 100°C
• What is a safety precaution when using a Bunsen burner?

  Turn off when not in use
• What safety precautions should be taken when purifying water?

  • Turn off Bunsen burner when not in use
  • Wear safety goggles when handling acids/alkalis
  • Clean up broken glassware immediately