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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+)
An acid with pH 1 is said to be very strong, and as the pH value increases, acidity decreases. So the pH values more than 7 indicate basicity. As the basicity increases, pH value will also increase and strong bases will have pH value 14. pH scale is logarithmic.