Lead Iodide Precipitation (Golden Rain)

Pb(NO3)2 + 2KI → PbI2↓ + 2KNO3

概要

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.

参加者

役割 物質 係数 状態
生成物 Potassium Nitrate KNO₃ 2 (aq)

日常の例

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

産業上の重要性

ヨウ化鉛はメチルアンモニウムヨウ化鉛ペロブスカイト太陽電池（次世代太陽電池）の前駆体として注目されている。ペロブスカイト太陽電池は効率23%超を達成しており、商業化に向けた研究が進んでいる。

特性

タイプ
Precipitation
可逆的
いいえ
エネルギー
発熱性
ΔH
-32.0 kJ/mol

関連する反応

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.