Question detail
Explain how chlorine is used in water treatment and the benefits it provides.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Group 7(17), the halogens
Question
Explain how chlorine is used in water treatment and the benefits it provides.
Answer
Chlorine is added to water to kill harmful bacteria and pathogens, ensuring the water is safe for drinking. It also helps to prevent the growth of algae and other microorganisms in water supplies.
Explanation
This answer is strong because it directly addresses the use of chlorine in water treatment, highlighting both its primary function and additional benefits. The question tests understanding of chlorine's role in public health and water safety.
Common mistake
Misunderstanding Chlorine's Role
Students often confuse the role of chlorine in water treatment as solely a disinfectant, neglecting its role in oxidation and the formation of chlorinated compounds.
Chlorine acts as a strong oxidizing agent in water treatment. When chlorine is added to water, it reacts to form hypochlorous acid (HOCl), which kills bacteria and other pathogens. The reaction can be summarized as: Cl2 + H2O ⇌ HOCl + HCl. This shows that chlorine not only disinfects but also contributes to the formation of chlorinated by-products.
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