Question

A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical materials which he can mix with the soil to adjust its pH.

Answer 1

• pH 4.2 means the soil is acidic. So we need to add basic substances to neutralise the soil.
• Slaked lime (calcium hydroxide) or chalk (calcium carbonate) are the two basic chemical substances which can be mixed with the soil to adjust its pH, if the soil is too acidic.
• All these materials are bases and hence react with the excess acid present in soil and reduce its acidity.