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Q » How does pH influence the effectiveness of chlorine disinfection?

John

03 Nov, 2025

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A » The effectiveness of chlorine disinfection is significantly influenced by pH levels. At lower pH levels, chlorine primarily exists as hypochlorous acid (HOCl), which is more effective at killing microorganisms. As the pH rises above 7.5, the balance shifts towards hypochlorite ion (OCl-), which is less effective. Hence, maintaining a pH between 6.5 and 7.5 is optimal for chlorine disinfection in water purification processes.

Michael

03 Nov, 2025

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A »pH affects chlorine disinfection by altering the distribution of hypochlorous acid (HOCl) and hypochlorite ion (OCl-). HOCl is the more effective disinfectant. At lower pH (8), OCl- prevails, reducing effectiveness. Optimal disinfection occurs at pH 6.5-7.5.

David

03 Nov, 2025

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