write the chemical equation for excess of carbon dioxide to passed through calcium hydroxide to form calcium hydrogen carbonate
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Ca(OH)2 + CO2-----CaHCO3+H2
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The CaCO3 precipitate causes the milkiness. If you pass excess CO2 through lime-water, the CaCO3 reacts with the excess CO2 and water to form calcium hydrogen carbonate or calcium bicarbonate.
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