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  • Chlorine in Water: Compounds Formed & Their Roles
    When chlorine gas (Cl₂) is added to water (H₂O), it undergoes a reaction to form several compounds, including:

    1. Hypochlorous acid (HOCl): This is the primary disinfectant formed and is responsible for killing bacteria and viruses.

    2. Hydrochloric acid (HCl): This is a strong acid that contributes to the acidity of the solution.

    3. Chloride ions (Cl⁻): These are produced from the dissociation of hydrochloric acid.

    4. Hypochlorite ions (ClO⁻): These are the conjugate base of hypochlorous acid and are also involved in disinfection.

    The reaction can be represented by the following equation:

    Cl₂ + H₂O ⇌ HOCl + HCl

    Important Note: The reaction is an equilibrium reaction, meaning that it can proceed in both directions. The relative amounts of the different compounds formed depend on the pH, temperature, and other factors.

    In summary:

    * Primary disinfectant: Hypochlorous acid (HOCl)

    * Strong acid: Hydrochloric acid (HCl)

    * Other products: Chloride ions (Cl⁻) and hypochlorite ions (ClO⁻)

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