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.