Carbon Dioxide Test

Rarely Tested
$$ Ca(OH)_2 + CO_2 \rightarrow CaCO_3 \downarrow + H_2O $$
$$ CaCO_3 + CO_2 + H_2O \rightarrow Ca(HCO_3)_2 $$

CO₂ turns lime water milky (CaCO₃ precipitate). Milkiness disappears with excess CO₂ due to soluble bicarbonate formation.

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