Lead Nitrate and Potassium Iodide (Golden Rain)

Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃

Tổng quan

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.

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, where glistening yellow crystals of PbI2 appear as a hot solution cools, is one of chemistry's most visually beautiful demonstrations.

Tầm quan trọng công nghiệp

Lead iodide has been investigated for use in perovskite solar cells (as methylammonium lead iodide) and in radiation detection applications.

Tính chất

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

Phản ứng liên quan

Iron(III) Chloride and Sodium Hydroxide Ammonia and Hydrochloric Acid (White Smoke) Calcium Carbonate and Hydrochloric Acid Calcium Chloride and Sodium Carbonate Barium Chloride and Sodium Sulfate Precipitation Calcium Hydroxide and Carbon Dioxide (Limewater Test) Sodium Hydroxide and Iron(III) Chloride (Rust Color) Sodium Hydroxide and Hydrochloric Acid Neutralization Potassium Hydroxide and Sulfuric Acid Aluminum Hydroxide and Hydrochloric Acid

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.