Calcium Hydroxide and Carbon Dioxide (Limewater Test)

Ca(OH)2 + CO2 → CaCO3 + H2O

Visão geral

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.

Participantes

Papel Substância Coeficiente Estado
Reagente Calcium Hydroxide Ca(OH)₂ 1 (aq)
Reagente Carbon Dioxide CO₂ 1 (g)
Produto Calcium Carbonate CaCO₃ 1 (s)
Produto Water H₂O 1 (l)

Exemplo do cotidiano

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

Importância industrial

Esta reação é utilizada na dessulfuração de gases de combustão, captura de carbono e na produção de carbonato de cálcio precipitado para as indústrias do papel e tintas.

Propriedades

Tipo
Double Replacement
Reversível
Não
Energia
Exotérmico
ΔH
-113,0 kJ/mol

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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.