GCSE Chemistry Required Practical - Water Purification
Analysing and purifying a sample of water and making it safe to drink.
In this practical you will:
- analyse a water sample
- purify a water sample by distillation
Activity 1: Analysing a sample of water
- Use the universal indicator paper to measure the pH of the water sample.
- Accurately weigh an empty evaporating basin and record to two decimal places.
- Pour 10 cm3 of water sample into the evaporating basin.
- Heat the evaporating basin on a tripod and gauze using a Bunsen burner until the solids start
to form and the majority of water has evaporated.
- Weigh the cooled evaporating basin again and calculate the mass of the solids that were
dissolved in the water.
- Record your results in a table.
Activity 2: Purifying a sample of water by distillation
- Place the water sample in the conical flask. Set up the apparatus for distillation as shown in
- Heat the water using the Bunsen burner until it boils. Then reduce the heat so that the water
- The distilled water will collect in the cooled test tube. Collect about 1 cm depth of water in this
way, then stop heating.
- Analyse the water you have distilled by determining its boiling point.
Water Purification & Testing - GCSE Science Required Practical (Triple)
How to test water for sodium and chloride ions before and after distilling.
00:00 Flame test for metal ions
01:50 Precipitation tests for non-metal ions
03:15 Distilling water
05:09 Testing distillate
GCSE Science Chemistry Required Practical: Water Purification
- Describe how to analyse a sample of water for purity.
- Describe how to purify a sample of water by distillation.
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