Lead Chloride Precipitation

Pb(NO3)2 + 2NaCl → PbCl2↓ + 2NaNO3

概述

Lead nitrate reacts with sodium chloride to form a white precipitate of lead chloride (Ksp = 1.7 × 10⁻⁵). PbCl₂ is moderately insoluble at room temperature but becomes quite soluble in hot water, distinguishing it from AgCl. The precipitate consists of fine needle-like crystals.

参与者

角色 物质 系数 状态
反应物 Sodium Chloride NaCl 2 (aq)
产物 Sodium Nitrate NaNO₃ 2 (aq)

日常示例

In qualitative analysis, PbCl₂ is separated from AgCl and Hg₂Cl₂ by dissolving it in hot water, a key step in Group I cation analysis.

工业重要性

氯化铅沉淀是铅回收工艺（火法精炼富集）和铅离子的定性分析（与AgCl和Hg₂Cl₂同属难溶氯化物）的化学基础，也用于了解铅在水处理中的行为。

属性

类型
Precipitation
可逆
否
能量
放热
ΔH
-14.0 kJ/mol

相关反应

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 Calcium Carbonate Precipitation Iron(III) Hydroxide Precipitation

Frequently Asked Questions

What is the equation for Lead Chloride Precipitation?
The balanced equation is: Pb(NO₃)₂ + 2NaCl → PbCl₂↓ + 2NaNO₃.
What type of reaction is Lead Chloride Precipitation?
Lead Chloride Precipitation is a precipitation reaction.
Is Lead Chloride Precipitation exothermic or endothermic?
Lead Chloride Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -14.0 kJ/mol.