Calcium Carbonate Precipitation

CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl

概要

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.

参加者

役割 物質 係数 状態
反応物 Sodium Carbonate Na₂CO₃ 1 (aq)
生成物 Calcium Carbonate CaCO₃ 1 (s)
生成物 Sodium Chloride NaCl 2 (aq)

日常の例

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

産業上の重要性

沈降性炭酸カルシウム(PCC)は、紙の充填剤、塗料、プラスチック、医薬品に使用されています。炭酸塩沈殿による軟水化は主要な工業プロセスです。

特性

タイプ
Precipitation
可逆的
いいえ
エネルギー
発熱性
ΔH
-13.0 kJ/mol

関連する反応

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.