Lead Nitrate and Potassium Iodide (Golden Rain)

Pb(NO3)2 + 2KI → PbI2 + 2KNO3

Aperçu

Lead(II) nitrate reacts with potassium iodide to form a bright yellow precipitate of lead(II) iodide and soluble potassium nitrate. When the hot solution is cooled slowly, beautiful golden yellow plate-like crystals form, creating the spectacular golden rain demonstration.

Participants

Rôle Substance Coefficient État
Produit Potassium Nitrate KNO₃ 2 (aq)

Exemple du quotidien

The golden rain experiment, where glistening yellow crystals of PbI2 appear as a hot solution cools, is one of chemistry's most visually beautiful demonstrations.

Importance industrielle

Lead iodide has been investigated for use in perovskite solar cells (as methylammonium lead iodide) and in radiation detection applications.

Propriétés

Type
Double Replacement
Réversible
Non
Énergie
Exothermique
ΔH
-32,0 kJ/mol

Réactions associées

Iron(III) Chloride and Sodium Hydroxide Ammonia and Hydrochloric Acid (White Smoke) Calcium Carbonate and Hydrochloric Acid Calcium Chloride and Sodium Carbonate Barium Chloride and Sodium Sulfate Precipitation Calcium Hydroxide and Carbon Dioxide (Limewater Test) Sodium Hydroxide and Iron(III) Chloride (Rust Color) Sodium Hydroxide and Hydrochloric Acid Neutralization Potassium Hydroxide and Sulfuric Acid Aluminum Hydroxide and Hydrochloric Acid

Frequently Asked Questions

What is the equation for Lead Nitrate and Potassium Iodide (Golden Rain)?
The balanced equation is: Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃.
What type of reaction is Lead Nitrate and Potassium Iodide (Golden Rain)?
Lead Nitrate and Potassium Iodide (Golden Rain) is a double replacement reaction.
Is Lead Nitrate and Potassium Iodide (Golden Rain) exothermic or endothermic?
Lead Nitrate and Potassium Iodide (Golden Rain) is exothermic (releases energy). The enthalpy change (ΔH) is -32.0 kJ/mol.