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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 scale was developed to measure how acidic or basic a substance is. This scale measures pH from 0-14. Acids have pH values between 0 and 7 and bases have pH values between 7 and 14. Pure water is neutral and has a pH of exactly 7. Indicators are used to measure the pH of a substance. Often times, plant extracts will change color if exposed to acidic or basic conditions and can therefore be used to indicate if a substance is an acid or a base. Todayâs experiment focuses on the use of litmus paper, a most basic pH paper dating back many years.