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A saturated solution of calcium hydroxide in water. When carbon dioxide gas is bubbled through limewater, a ‘milky’ precipitate of calcium carbonate is formed:Ca(OH)2(aq)+CO2(g) → CaCO3(s)+H2O(l) If the carbon dioxide continues to be bubbled through, the calcium carbonate eventually redissolves to form a clear solution of calcium hydrogencarbonate:CaCO3(s)+CO2(g)+H2O(g) → Ca(HCO3)2(aq) If cold limewater is used the original calcium carbonate precipitated has a calcite structure; hot limewater yields an aragonite structure.

Ca(OH)2(aq)+CO2(g) → CaCO3(s)+H2O(l)

CaCO3(s)+CO2(g)+H2O(g) → Ca(HCO3)2(aq)

Subjects: Chemistry.

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