Ordinary limestone can be used to neutralize acidity in lakes caused by acid rain. It can also be used to neutralize acid soil in fields. It works much better and faster if turned into slaked lime first.

First, the limestone, which is mostly calcium carbonate, is heated, turning it into calcium oxide.

CaCO3 -> CaO + CO2

CaO is also known as quicklime. This quicklime then reacts violently with water to form slaked lime -

CaO + H2O -> Ca(OH)2

Slaked lime is a white powder that can be applied to fields/lakes just like powdered limestone.

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