Chlorine Displacing Iodine from Potassium Iodide

Cl2 + 2KI → 2KCl + I2

Overview

Chlorine displaces iodine from potassium iodide solution because chlorine is more electronegative and a stronger oxidizer than iodine. The solution turns brown from the liberated iodine, which can be confirmed with starch indicator turning blue-black.

Participants

Role Substance Coefficient State
Reactant Chlorine Cl 1 (g)
Product Iodine I 1 (s)
Product Potassium Chloride KCl 2 (aq)

Everyday Example

The starch-iodine test, where freed iodine turns starch blue-black, is a common chemistry experiment demonstrating this halogen displacement.

Industrial Importance

Halogen displacement series understanding is fundamental to water disinfection chemistry and halogen manufacturing processes.

Properties

Type
Single Replacement
Reversible
No
Energy
Exothermic
ΔH
-170.0 kJ/mol

Related Reactions

Aluminum Reacting with Hydrochloric Acid Aluminum Reacting with Iron(III) Oxide (Thermite) Aluminum Reducing Chromium Oxide (Aluminothermic) Calcium Reacting with Water Carbon Reducing Iron Oxide in Blast Furnace Chlorine Displacing Bromine from Sodium Bromide Copper Displacing Silver from Silver Nitrate Fluorine Displacing Chlorine from Sodium Chloride Hydrogen Reducing Copper Oxide Iron Displacing Copper from Copper Sulfate

Frequently Asked Questions

What is the equation for Chlorine Displacing Iodine from Potassium Iodide?
The balanced equation is: Cl₂ + 2KI → 2KCl + I₂.
What type of reaction is Chlorine Displacing Iodine from Potassium Iodide?
Chlorine Displacing Iodine from Potassium Iodide is a single replacement reaction.
Is Chlorine Displacing Iodine from Potassium Iodide exothermic or endothermic?
Chlorine Displacing Iodine from Potassium Iodide is exothermic (releases energy). The enthalpy change (ΔH) is -170.0 kJ/mol.