Soda Lime - Chemical Reaction

Chemical Reaction

The overall reaction is:

CO2 + Ca(OH)2 → CaCO3 + H2O + heat (in the presence of water)

The reaction can be considered as a strong base catalysed, water facilitated reaction.

Mechanism:

1) CO2 + H2O → CO2 (aq) (CO2 dissolves in water - slow and rate determining)

2) CO2 (aq) + NaOH → NaHCO3 (bicarbonate formation at high pH)

3) NaHCO3 + Ca(OH)2 → CaCO3 + H2O + NaOH (NaOH recycled to step 2) - hence a catalyst)

Each mole of CO2 (44g) reacted produces one mole of water (18g)

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