Iron(III) Hydroxide Precipitation

FeCl3 + 3NaOH → Fe(OH)3↓ + 3NaCl

Übersicht

Iron(III) chloride reacts with sodium hydroxide to form a rust-brown gelatinous precipitate of iron(III) hydroxide. Fe(OH)₃ has an extremely low Ksp of 2.8 × 10⁻³⁹, precipitating even at slightly acidic pH. The gelatinous nature makes it an excellent flocculant for water treatment.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Iron(III) Chloride FeCl₃ 1 (aq)
Reaktant Sodium Hydroxide NaOH 3 (aq)
Produkt Sodium Chloride NaCl 3 (aq)

Alltägliches Beispiel

The rust-colored sludge in water treatment plants is mainly iron(III) hydroxide precipitated by adding base to iron-rich water.

Industrielle Bedeutung

Iron(III) hydroxide precipitation is the primary method for iron removal from drinking water and is used as a coagulant in wastewater treatment.

Eigenschaften

Typ
Precipitation
Reversibel
Nein
Energie
Exotherm
ΔH
-88,0 kJ/mol

Verwandte Reaktionen

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 Calcium Carbonate Precipitation Aluminum Hydroxide Precipitation

Frequently Asked Questions

What is the equation for Iron(III) Hydroxide Precipitation?
The balanced equation is: FeCl₃ + 3NaOH → Fe(OH)₃↓ + 3NaCl.
What type of reaction is Iron(III) Hydroxide Precipitation?
Iron(III) Hydroxide Precipitation is a precipitation reaction.
Is Iron(III) Hydroxide Precipitation exothermic or endothermic?
Iron(III) Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -88.0 kJ/mol.