Iron(III) Hydroxide Precipitation

FeCl3 + 3NaOH → Fe(OH)3↓ + 3NaCl

Descripción general

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.

Participantes

Rol Sustancia Coeficiente Estado
Reactivo Iron(III) Chloride FeCl₃ 1 (aq)
Reactivo Sodium Hydroxide NaOH 3 (aq)
Producto Sodium Chloride NaCl 3 (aq)

Ejemplo cotidiano

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

Importancia industrial

La precipitación del hidróxido de hierro(III) es el método principal para la eliminación de hierro del agua potable y se usa como coagulante en plantas de tratamiento de agua a escala mundial.

Propiedades

Tipo
Precipitation
Reversible
No
Energía
Exotérmico
ΔH
-88,0 kJ/mol

Reacciones relacionadas

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.