Purifying water

• Aims:

  • To analyse samples of water from different sources in terms of pH and the presence of dissolved solids
  • To distil sea water to obtain potable water
• step 1: for each sample of water you are give test the pH using either a pH metre or universal indicator and an appropriate colour chart, record your observations
• step 2:for each sample of water pour 50 cm3 into a clean pre-weighed evaporating basin. heat gently over a Bunsen burner ,tripod and gauze until no liquid remains. allow to coool then weigh the evaporating basin again and calculate the mass of solid that remains in the evaporating basin
• step 3: set up your distillation apparatus as demonstrated by your teacher
• step 4: heat your sea water solution until it boils gently
• step 5: after a period of time you should see distilled water being produced