Lead Nitrate and Potassium Iodide (Golden Rain)

Pb(NO3)2 + 2KI → PbI2 + 2KNO3

概述

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.

参与者

角色 物质 系数 状态
产物 Potassium Nitrate KNO₃ 2 (aq)

日常示例

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.

工业重要性

碘化铅被研究用于钙钛矿太阳能电池（甲铵铅碘型）及放射线探测应用，PbI₂的金黄色金雨沉淀实验是化学课最受欢迎的演示之一。

属性

类型
Double Replacement
可逆
否
能量
放热
ΔH
-32.0 kJ/mol

相关反应

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.