The reaction between chlorine gas (Cl₂) and potassium iodide solution (KI) is a single displacement reaction. Here's the balanced chemical equation:

Cl₂ (g) + 2 KI (aq) → 2 KCl (aq) + I₂ (s)

Here's a breakdown of the reaction:

* Chlorine gas (Cl₂) is a strong oxidizing agent.

* Potassium iodide (KI) is a solution of potassium ions (K⁺) and iodide ions (I⁻).

* Chlorine displaces iodide ions from the solution.

* Potassium chloride (KCl) is formed, which is soluble in water.

* Iodine (I₂) is formed as a solid precipitate.

The reaction is characterized by the formation of a brown-black precipitate of iodine, which is a distinctive indicator of this reaction.