Calcium Carbonate Precipitation

CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl

Übersicht

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.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Sodium Carbonate Na₂CO₃ 1 (aq)
Produkt Calcium Carbonate CaCO₃ 1 (s)
Produkt Sodium Chloride NaCl 2 (aq)

Alltägliches Beispiel

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

Industrielle Bedeutung

Precipitated calcium carbonate (PCC) is used as a paper filler, in paints, plastics, and pharmaceuticals. Water softening by carbonate precipitation is a major industrial process.

Eigenschaften

Typ
Precipitation
Reversibel
Nein
Energie
Exotherm
ΔH
-13,0 kJ/mol

Verwandte Reaktionen

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.