Lead Iodide Precipitation (Golden Rain)

Pb(NO₃)₂ + 2KI → PbI₂↓ + 2KNO₃

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Sản phẩm	Potassium Nitrate KNO₃	2	(aq)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

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

Tính chất

Loại: Precipitation
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -32,0 kJ/mol

Phản ứng liên quan

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.