Lead Iodide Precipitation (Golden Rain)

Pb(NO3)2 + 2KI → PbI2↓ + 2KNO3

Descripción general

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.

Participantes

Rol Sustancia Coeficiente Estado
Producto Potassium Nitrate KNO₃ 2 (aq)

Ejemplo cotidiano

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

Importancia industrial

El yoduro de plomo es precursor del yoduro de plomo-metilamonio de perovskita, utilizado en células solares de nueva generación con eficiencias superiores al 25%.

Propiedades

Tipo
Precipitation
Reversible
No
Energía
Exotérmico
ΔH
-32,0 kJ/mol

Reacciones relacionadas

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.