Question

why powdered limestone is sprayed on polluted lakes?

Answer 1

Answer:

To neutralize acid waters

Explanation:

Liming is the process of adding limestone (calcite), primarily calcium carbonate (CaCO3), to acidic waters and soils in order to neutralize them and protect them against pH variations. Lake and pond water can be kept safe for aquatic life by adding limestone to keep the pH around neutral (pH 7).