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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+)
Best Answer: any pH level under 7 is considered an acid. 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. Source(s): I passed chemistry. Any PH level under 7 is considered Acid, and over 7 is considered Base. Therefore, 7 is neutral. Water should have PH of 7, but impurity of the tap water would cause it to have slightly acidic PH, somewhere around 6.7.