Calcium Carbonate Precipitation

CaCl₂ + Na₂CO₃ → CaCO₃↓ + 2NaCl

Visão geral

Calcium chloride reacts with sodium carbonate to precipitate calcium carbonate. CaCO₃ has a Ksp of 3.4 × 10⁻⁹. This is the fundamental reaction behind water softening, where dissolved calcium (hardness) is removed as insoluble carbonate. The precipitate is a white powder.

Participantes

Papel	Substância	Coeficiente	Estado
Reagente	Sodium Carbonate Na₂CO₃	1	(aq)
Produto	Calcium Carbonate CaCO₃	1	(s)
Produto	Sodium Chloride NaCl	2	(aq)

Exemplo do cotidiano

Limescale buildup in kettles and pipes is calcium carbonate precipitated from hard water when heated or evaporated.

Importância industrial

O carbonato de cálcio precipitado (PCC) é utilizado como carga em papel, em tintas, plásticos e produtos farmacêuticos. O amaciamento de água por precipitação de carbonato é um importante processo industrial.

Propriedades

Tipo: Precipitation
Reversível: Não
Energia: Exotérmico
ΔH: -13,0 kJ/mol

Reações relacionadas

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 Calcium Carbonate Precipitation?

The balanced equation is: CaCl₂ + Na₂CO₃ → CaCO₃↓ + 2NaCl.

What type of reaction is Calcium Carbonate Precipitation?

Calcium Carbonate Precipitation is a precipitation reaction.

Is Calcium Carbonate Precipitation exothermic or endothermic?

Calcium Carbonate Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -13.0 kJ/mol.