The following process is used to purify water for drinking - HSC - SSCE Chemistry - Question 11 - 2009 - Paper 1
Question 11
The following process is used to purify water for drinking.
Step 1: Screening
Step 2: ?
Step 3: ?
Step 4: ?
Step 5: Chlorination
Which sequence represents the ... show full transcript
Worked Solution & Example Answer:The following process is used to purify water for drinking - HSC - SSCE Chemistry - Question 11 - 2009 - Paper 1
Step 1
Step 2: Flocculation
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Answer
In this step, chemicals are added to the water that cause particulate matter to clump together. This process helps make the solids easier to remove in subsequent steps.
Step 2
Step 3: Settling
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Following flocculation, the water is allowed to sit, allowing the larger flocs to settle at the bottom. This results in clearer water above the sediment.
Step 3
Step 4: pH adjustment
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Adjusting the pH is crucial after settling to ensure the water is suited for chlorination and safe for drinking. This step may involve adding acid or bases to achieve the desired pH level.
