Iron(III) Hydroxide Precipitation

FeCl₃ + 3NaOH → Fe(OH)₃↓ + 3NaCl

Visão geral

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

Papel	Substância	Coeficiente	Estado
Reagente	Iron(III) Chloride FeCl₃	1	(aq)
Reagente	Sodium Hydroxide NaOH	3	(aq)
Produto	Sodium Chloride NaCl	3	(aq)

Exemplo do cotidiano

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

Importância industrial

A precipitação de hidróxido de ferro(III) é o principal método de remoção de ferro em água potável e águas residuais industriais. O Fe(OH)₃ é também utilizado como adsorvente para a remoção de arsénio e outros metais pesados.

Propriedades

Tipo: Precipitation
Reversível: Não
Energia: Exotérmico
ΔH: -88,0 kJ/mol

Reações 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.