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Question
The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?
Solution
Soil B, with a pH of 4.5, is very acidic and is thus not suitable for the normal growth of plants. Therefore, to reduce its acidity, soil B should be treated with powdered chalk (CaCO3), which is a base.
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