Question

How can pH of acidic soil be raised?

Answer 1

Have you never done any gardening?

Explanation:

Gardeners commonly add agricultural lime to raise the `pH` of the soil; and such lime is powdered limestone or chalk, i.e. `CaCO_3`.

`CO_3^(2-) +H_2O(l) rightleftharpoonsHCO_3^(-) + HO^-`

How does this reaction modify `pH`?

Some plants and vegetables (legumes, lettuces) thrive in slightly alkaline soil, whereas some prefer a slightly acid soil (e.g. tomatoes). Of course, plants are biological species, and the optimum `pH` would be approx. `pH=5.5-8.0`