Lead Iodide Precipitation (Golden Rain)

Pb(NO3)2 + 2KI → PbI2↓ + 2KNO3

개요

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.

참여 물질

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

일상 속 예시

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

산업적 중요성

페로브스카이트 태양전지(CH₃NH₃PbI₃)의 핵심 전구체입니다. 핵 의학에서 방사성 아이오딘화납이 방사성 동위원소 검출에 사용됩니다.

성질

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

관련 반응

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.