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A soil is acidic because there are compounds within it which dissolve in water to form an acid. An acid is defined as a substance which readily gives out protons to oter molecules. An alkali is the converse, in that it is a proton acceptor and readily takes on protons. Treating an acidic soil with an alkali would neutralise the soil, and so the soil would become less acidic. If enough alkali is added, the soil will become neutral, and it will become alkaline if even more alkali is added.

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Q: How does alkali help to treat acidic soil?
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