Water in Britain is taken from reservoirs to use as drinking water - AQA - GCSE Chemistry - Question 1 - 2014 - Paper 3
Question 1
Water in Britain is taken from reservoirs to use as drinking water.
Figure 1
1 (a) What are the two main steps used to treat water from reservoirs?
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Worked Solution & Example Answer:Water in Britain is taken from reservoirs to use as drinking water - AQA - GCSE Chemistry - Question 1 - 2014 - Paper 3
Step 1
What are the two main steps used to treat water from reservoirs?
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Answer
The two main steps used to treat water from reservoirs are:
Filtration: This step removes solids or insoluble particles from the water, ensuring that the water is clear and free from physical contaminants.
Chlorination: In this step, chlorine is added to the water to reduce the number of microbes, making the water safe for consumption.
Step 2
What is in water filters that removes hardness from water?
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Answer
Water filters often contain ion exchange resins, which replace calcium and magnesium ions, responsible for water hardness, with sodium ions. This process effectively softens the water.
Step 3
Suggest why water filters used in the home contain particles of silver.
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Water filters contain particles of silver because they help to prevent the growth of microbes, ensuring the water is not only purified from hardness but also safe from harmful bacteria and germs.
Step 4
Why is distillation not usually an economic method of treating water for drinking?
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Distillation is not usually an economic method for treating water because it requires a high cost of energy, making the process expensive compared to other water treatment methods.
Step 5
State one health benefit of drinking hard water.
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One health benefit of drinking hard water is that it helps to maintain and develop strong bones and teeth, due to the presence of essential minerals such as calcium and magnesium.
