Iron(III) Hydroxide Precipitation
FeCl3 + 3NaOH → Fe(OH)3↓ + 3NaCl
Aperçu
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.
Participants
| Rôle | Substance | Coefficient | État |
|---|---|---|---|
| Réactif | Iron(III) Chloride FeCl₃ | 1 | (aq) |
| Réactif | Sodium Hydroxide NaOH | 3 | (aq) |
| Produit | Sodium Chloride NaCl | 3 | (aq) |
Exemple du quotidien
The rust-colored sludge in water treatment plants is mainly iron(III) hydroxide precipitated by adding base to iron-rich water.
Importance industrielle
Iron(III) hydroxide precipitation is the primary method for iron removal from drinking water and is used as a coagulant in wastewater treatment.
Propriétés
- Type
- Precipitation
- Réversible
- Non
- Énergie
- Exothermique
- ΔH
- -88,0 kJ/mol
Réactions associées
Barium Sulfate Precipitation
Cadmium Sulfide Precipitation (Yellow)
Calcium Phosphate Precipitation (Bone Mineral)
Chromium(III) Hydroxide Precipitation
Lead Carbonate Precipitation
Magnesium Hydroxide Precipitation
Copper Sulfide Precipitation
Cobalt(II) Hydroxide Precipitation
Mercury(II) Sulfide Precipitation (Vermilion)
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.