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Potable water is water that is suitable for drinking - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2022 - Paper 1
Question 2
Potable water is water that is suitable for drinking. (a) River water can be treated to make it potable. Chlorination, filtration and sedimentation are three of the... show full transcript
Worked Solution & Example Answer:Potable water is water that is suitable for drinking - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2022 - Paper 1
Step 1
Which row of the table shows these three processes in the order in which they are carried out?
Answer
The correct row is B: chlorination is carried out first to kill bacteria, followed by filtration to remove smaller particles, and finally sedimentation to allow remaining impurities to settle.
Step 2
Step 3
Describe how sedimentation is carried out.
Answer
Sedimentation is carried out by allowing the water to sit undisturbed in a tank for a certain period. During this time, heavier particles and impurities settle at the bottom, forming sediment. The clear water at the top can then be carefully removed for further treatment.