Which gives carbon dioxide on heating slaked lime or limestone?

Slaked lime Ca(OH)2 on heating gives calcium oxide and water. Limestone CaCO3 on heating gives calcium oxide and carbon dioxide. Slaked lime is used to reduce the acidity of lakes and soils. Lakes and soils can become acidic because of acid rain. It acts faster than powdered limestone but is more expensive. Slaked lime dissolves a little in water to form lime water.

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