Lead Nitrate and Potassium Iodide (Golden Rain)

Pb(NO3)2 + 2KI → PbI2 + 2KNO3

Visão geral

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.

Participantes

Papel Substância Coeficiente Estado
Produto Potassium Nitrate KNO₃ 2 (aq)

Exemplo do cotidiano

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.

Importância industrial

O iodeto de chumbo tem sido investigado para utilização em células solares de perovsite (como iodeto de metilamónio e chumbo) e em aplicações de detecção de radiação.

Propriedades

Tipo
Double Replacement
Reversível
Não
Energia
Exotérmico
ΔH
-32,0 kJ/mol

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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.