The reaction between chlorine and water is a complex one, resulting in a disproportionation reaction. This means that the chlorine atoms undergo both oxidation and reduction. Here's a breakdown of the process:

Overall Reaction:

Cl₂(g) + H₂O(l) ⇌ HCl(aq) + HOCl(aq)

Explanation:

1. Chlorine dissolves in water: Chlorine gas (Cl₂) dissolves in water to form a solution containing dissolved chlorine molecules (Cl₂(aq)).

2. Hydrolysis: Some of the dissolved chlorine molecules react with water molecules in a hydrolysis reaction, which is the reaction with water to form ions:

Cl₂(aq) + H₂O(l) ⇌ HCl(aq) + HOCl(aq)

3. Disproportionation: This reaction is a disproportionation reaction because chlorine atoms are both oxidized and reduced:

* Oxidation: Chlorine atoms in Cl₂ are oxidized to form hypochlorous acid (HOCl). The oxidation number of chlorine goes from 0 in Cl₂ to +1 in HOCl.

* Reduction: Chlorine atoms in Cl₂ are reduced to form hydrochloric acid (HCl). The oxidation number of chlorine goes from 0 in Cl₂ to -1 in HCl.

Important Points:

* Equilibrium: The reaction is an equilibrium reaction, meaning it can proceed in both directions. The relative amounts of HCl and HOCl produced depend on the pH and temperature.

* Hypochlorous Acid (HOCl): This is a weak acid that is a powerful disinfectant and is responsible for the germicidal properties of chlorine in water.

* Hydrochloric Acid (HCl): This is a strong acid that contributes to the acidity of the water.

Practical Applications:

This reaction is the basis for the use of chlorine as a disinfectant in:

* Swimming Pools: Chlorine is added to swimming pools to kill bacteria and other microorganisms.

* Drinking Water: Chlorine is used to disinfect drinking water supplies.

Let me know if you'd like more information about any specific aspect of this reaction!