Calcium Hydroxide and Carbon Dioxide (Limewater Test)

Ca(OH)2 + CO2 → CaCO3 + H2O

Tổng quan

Calcium hydroxide solution (limewater) turns milky white when carbon dioxide is bubbled through it, due to the formation of insoluble calcium carbonate particles. This is the classic test for carbon dioxide gas. With excess CO2, the milkiness disappears as soluble calcium bicarbonate forms.

Người tham gia

Vai trò Chất Hệ số Trạng thái
Chất phản ứng Calcium Hydroxide Ca(OH)₂ 1 (aq)
Chất phản ứng Carbon Dioxide CO₂ 1 (g)
Sản phẩm Calcium Carbonate CaCO₃ 1 (s)
Sản phẩm Water H₂O 1 (l)

Ví dụ thực tế

The limewater test is taught in every introductory chemistry course as the standard qualitative test for carbon dioxide gas.

Tầm quan trọng công nghiệp

This reaction is used in flue gas desulfurization, carbon capture, and in the production of precipitated calcium carbonate for paper and paint industries.

Tính chất

Loại
Double Replacement
Thuận nghịch
Không
Năng lượng
Tỏa nhiệt
ΔH
-113,0 kJ/mol

Phản ứng liên quan

Iron(III) Chloride and Sodium Hydroxide Ammonia and Hydrochloric Acid (White Smoke) Calcium Carbonate and Hydrochloric Acid Calcium Chloride and Sodium Carbonate Barium Chloride and Sodium Sulfate Precipitation Sodium Hydroxide and Iron(III) Chloride (Rust Color) Sodium Hydroxide and Hydrochloric Acid Neutralization Potassium Hydroxide and Sulfuric Acid Sodium Carbonate and Hydrochloric Acid Aluminum Hydroxide and Hydrochloric Acid

Frequently Asked Questions

What is the equation for Calcium Hydroxide and Carbon Dioxide (Limewater Test)?
The balanced equation is: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O.
What type of reaction is Calcium Hydroxide and Carbon Dioxide (Limewater Test)?
Calcium Hydroxide and Carbon Dioxide (Limewater Test) is a double replacement reaction.
Is Calcium Hydroxide and Carbon Dioxide (Limewater Test) exothermic or endothermic?
Calcium Hydroxide and Carbon Dioxide (Limewater Test) is exothermic (releases energy). The enthalpy change (ΔH) is -113.0 kJ/mol.