Calcium Carbonate Precipitation

CaCl₂ + Na₂CO₃ → CaCO₃↓ + 2NaCl

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Sodium Carbonate Na₂CO₃	1	(aq)
Sản phẩm	Calcium Carbonate CaCO₃	1	(s)
Sản phẩm	Sodium Chloride NaCl	2	(aq)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

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.

Tính chất

Loại: Precipitation
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -13,0 kJ/mol

Phản ứng liên quan

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.