Calcium Hydroxide is a white crystalline inorganic compound with the chemical formula Ca(OH)₂, commonly known as slaked lime or hydrated lime, produced by reacting calcium oxide (quicklime) with water in an exothermic reaction.​

Primary applications of calcium hydroxide are construction (mortar, plaster, cement), water treatment (pH adjustment, softening), chemical manufacturing, food processing (E526 additive), agriculture (soil amendment), and environmental remediation (flue gas desulfurization, wastewater neutralization).​

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