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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+)
The pH level of water defines how acidic or basic it is. While some plants grow better with a higher, or more basic or alkaline pH level, others need a lower, or more acidic pH level to thrive (See Resources 1).