Lead Iodide Precipitation (Golden Rain)

Pb(NO3)2 + 2KI → PbI2↓ + 2KNO3

Übersicht

Lead nitrate and potassium iodide form a bright yellow precipitate of lead iodide. When the hot mixture is cooled slowly, lead iodide crystallizes as golden shimmering plates, creating the spectacular golden rain demonstration. PbI₂ has a Ksp of 9.8 × 10⁻⁹ and is more soluble in hot water.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Produkt Potassium Nitrate KNO₃ 2 (aq)

Alltägliches Beispiel

The golden rain experiment produces one of chemistry's most visually stunning displays as golden PbI₂ crystals settle like glittering snow.

Industrielle Bedeutung

Lead iodide is a precursor to methylammonium lead iodide perovskite used in next-generation solar cells with efficiency above 25%.

Eigenschaften

Typ
Precipitation
Reversibel
Nein
Energie
Exotherm
ΔH
-32,0 kJ/mol

Verwandte Reaktionen

Aluminum Hydroxide Precipitation Barium Carbonate Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Fluoride Precipitation (Fluorite) Calcium Phosphate Precipitation (Bone Mineral) Chromium(III) Hydroxide Precipitation Lead Carbonate Precipitation Lead Chloride Precipitation Iron(III) Hydroxide Precipitation

Frequently Asked Questions

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