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When pH is 1, 2 3 4 5 or 6, it is considered an Acid. When pH is 8 9 10 11 12 13 or 14, it is considered a Base. 7 is the neutral point of acid and base. pH is calculated by the -log (H+)
Balancing your soil's pH Levels. The pH rating simply means how much acid (acidity) or how much alkaline (alkalinity) is present in the soil. The pH range is 1 ? 14 and 7 is the mid-point, meaning ? acidity to ? alkalinity.