FDEP Water Treatment C Practice Exam 2025 – The Comprehensive All-in-One Guide to Master Your Certification!

Question: 1 / 400

What happens to the pH of water when chlorine gas is added?

it remains unchanged

it decreases due to the formation of acids

When chlorine gas is added to water, it forms hydrochloric acid and hypochlorous acid, leading to a decrease in pH. This occurs because the formation of these acids introduces more hydrogen ions (H+) into the water, which lowers the pH level. As a result, chlorine addition makes the solution more acidic.

Understanding the chemistry involved is key here; chlorine reacts with water through a hydrolysis process. The reaction produces acids that shift the balance of hydrogen and hydroxide ions, ultimately resulting in a more acidic environment and therefore a decreased pH. This is an important consideration in water treatment since maintaining appropriate pH levels is crucial for effective disinfection and the overall quality of the water being treated.

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it increases due to the formation of hydroxides

it becomes neutral

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