Practical—Water

• Analyzing a sample of water for purity

  1. Check the pH of the water using universal indicator paper

  2. Test for dissolved solids by evaporating the water in an evaporating Basin and weighing it before and after evaporation
• Potable water


  Safe to drink
• Pure water


  Contains no dissolved solids such as salts and has a pH of 7 (neutral)
• Potable water is not the same as pure water
• If the pH of water is 7, it does not necessarily mean the water is pure
• Purifying a sample of water by distillation

  Heat the water in a conical flask, let it evaporate, collect the steam in a test tube, and condense it back into liquid water
• Distilled water contains no dissolved solids and has a pH of 7, making it pure water