Iron (III) chloride and aluminium sulphate are two chemicals that can be used in the purification of town water supplies - HSC - SSCE Chemistry - Question 5 - 2011 - Paper 1
Question 5
Iron (III) chloride and aluminium sulphate are two chemicals that can be used in the purification of town water supplies. What is the role of these chemicals?
(A) T... show full transcript
Worked Solution & Example Answer:Iron (III) chloride and aluminium sulphate are two chemicals that can be used in the purification of town water supplies - HSC - SSCE Chemistry - Question 5 - 2011 - Paper 1
Step 1
To disinfect water by removing bacteria
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Answer
While disinfecting water and removing bacteria is an important objective in water purification, Iron (III) chloride and aluminium sulphate primarily serve other functions and are not used primarily for disinfection.
Step 2
To remove particulate material by flocculation
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Answer
Iron (III) chloride and aluminium sulphate are used as coagulants in the flocculation process. They help agglomerate particles and impurities, allowing them to be removed effectively from water. This is a key role in water purification.
Step 3
To control the concentration of total dissolved solids
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Answer
These chemicals do not play a direct role in controlling the concentration of total dissolved solids in water. Their main function is related to the removal of particulates rather than dissolving solids.
Step 4
To control the pH of the water within the required range
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Answer
Iron (III) chloride and aluminium sulphate can influence the pH level during water treatment; however, their primary function is more closely aligned with coagulation rather than direct pH control.
