Lead Iodide Precipitation (Golden Rain)

Pb(NO₃)₂ + 2KI → PbI₂↓ + 2KNO₃

Обзор

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.

Участники

Роль	Вещество	Коэффициент	Состояние
Продукт	Potassium Nitrate KNO₃	2	(aq)

Пример из жизни

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

Промышленное значение

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

Свойства

Тип: Precipitation
Обратимая: Нет
Энергия: Экзотермическая
ΔH: -32,0 kJ/mol

Связанные реакции

Aluminum Hydroxide Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Phosphate Precipitation (Bone Mineral) Chromium(III) Hydroxide Precipitation Lead Carbonate Precipitation Magnesium Hydroxide Precipitation Copper Sulfide Precipitation Cobalt(II) Hydroxide 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.