Lead Nitrate and Potassium Iodide (Golden Rain)

Pb(NO3)2 + 2KI → PbI2 + 2KNO3

概要

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.

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

産業上の重要性

ヨウ化鉛はペロブスカイト太陽電池（メチルアンモニウムヨウ化鉛として）の研究において注目される化合物である。また、蛍光体やX線検出材料としても研究されている。

特性

タイプ
Double Replacement
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

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.