Ferric Phosphate Precipitation (Water Treatment)

FeCl₃ + Na₃PO₄ → FePO₄↓ + 3NaCl

Aperçu

Iron(III) chloride reacts with trisodium phosphate to form an insoluble yellowish-white precipitate of iron(III) phosphate (Ksp = 9.9 × 10⁻¹⁶). This precipitation is the primary method for removing phosphate from wastewater to prevent eutrophication of receiving waters.

Participants

Rôle	Substance	Coefficient	État
Réactif	Iron(III) Chloride FeCl₃	1	(aq)
Produit	Sodium Chloride NaCl	3	(aq)

Exemple du quotidien

Iron phosphate is used as an organic slug bait in gardens, sold under brand names like Sluggo. It is safe around pets and wildlife.

Importance industrielle

Phosphate removal by iron(III) precipitation is a critical step in wastewater treatment worldwide, preventing algal blooms and eutrophication in lakes and rivers.

Propriétés

Type: Precipitation
Réversible: Non
Énergie: Exothermique
ΔH: -95,0 kJ/mol

Réactions associées

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 Ferric Phosphate Precipitation (Water Treatment)?

The balanced equation is: FeCl₃ + Na₃PO₄ → FePO₄↓ + 3NaCl.

What type of reaction is Ferric Phosphate Precipitation (Water Treatment)?

Ferric Phosphate Precipitation (Water Treatment) is a precipitation reaction.

Is Ferric Phosphate Precipitation (Water Treatment) exothermic or endothermic?

Ferric Phosphate Precipitation (Water Treatment) is exothermic (releases energy). The enthalpy change (ΔH) is -95.0 kJ/mol.