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Lime water, or calcium hydroxide solution, reacts with the carbon dioxide of the air.Ca(OH)2 + CO2 --> CaCO3 + H2OThis is the same reaction which we use in the lab for a test for carbon dioxide.But then a further reaction happens:CaCO3 + CO2 + H2O --> Ca(HCO3)2 The calcium hydrogen carbonate is soluble, so the solution looks the same as it did at the start. As the hydroxide ions are no longer present, the alkalinity is reduced. These reactions are a nuisance in the lab, because lime water which 'goes off' like this will not give the 'carbon dioxide goes milky' test.

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Q: How come slaked lime water calcium hydroxide plus water loses it alkalinity over time I am a hobby mushroom grower?
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