Lead Chloride Precipitation

Pb(NO₃)₂ + 2NaCl → PbCl₂↓ + 2NaNO₃

Overview

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.

Participants

Role	Substance	Coefficient	State
Reactant	Sodium Chloride NaCl	2	(aq)
Product	Sodium Nitrate NaNO₃	2	(aq)

Everyday Example

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

Industrial Importance

Lead chloride precipitation is important in lead recycling processes and in understanding lead contamination behavior in water treatment.

Properties

Type: Precipitation
Reversible: No
Energy: Exothermic
ΔH: -14.0 kJ/mol

Related Reactions

Aluminum Hydroxide Precipitation Barium Carbonate Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Carbonate Precipitation Calcium Fluoride Precipitation (Fluorite) Calcium Oxalate Precipitation (Kidney Stones) Calcium Phosphate Precipitation (Bone Mineral) Calcium Sulfate Precipitation (Gypsum) Chromium(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.