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Ca Oxide, Hydroxide, CarbonateCalcium oxide combines with dilute acids to form the ions of the corresponding calcium salt. It absorbs CO2 from the air, becoming CaCO3. In moist air CaO becomes Ca(OH)2, the reaction taking place rapidly, with increase in volume and generation of significant heat if sufficient water is present. The Ca(OH)2 dissolves readily in dilute acids and is much less soluble in water than the corresponding Ba and Sr hydroxides. The oxide, hydroxide and carbonate are all readily soluble in dilute acids. Most analysts prefer dilute (1:1) nitric acid.
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