Lead Nitrate and Potassium Iodide (Golden Rain)

Pb(NO3)2 + 2KI → PbI2 + 2KNO3

개요

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.

참여 물질

역할 물질 계수 상태
생성물 Potassium Nitrate KNO₃ 2 (aq)

일상 속 예시

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.

산업적 중요성

시각적으로 인상적인 침전 반응으로 화학 교육 실험에 활용됩니다. PbI₂는 페로브스카이트 태양전지 및 X선 검출기 소재 연구에 중요합니다.

성질

유형
Double Replacement
가역 반응
아니오
에너지
발열
ΔH
-32.0 kJ/mol

관련 반응

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.