What is a Calcium hydroxide (Ca(OH)₂)?

Calcium hydroxide (Ca(OH)₂), commonly known as "slaked lime" or "hydrated lime", is a white powdery or crystalline inorganic compound. It is produced by adding water to quicklime (calcium oxide), which is derived by heating limestone (calcium carbonate). It dissolves in water to form an alkaline solution known as limewater. It has many uses, including in construction materials (like mortar and plaster), soil conditioning in agriculture, neutralization of acidic wastewater, food additives (as a pH regulator), and water softening in water treatment. It is also widely used for neutralizing acids in various industrial processes.

Because it is hygroscopic and reacts with carbon dioxide in the air to form calcium carbonate, it should be stored in a sealed container. Due to its strong alkalinity, it can irritate the skin and eyes, so proper protective equipment is recommended during handling.

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