1. The concentration of hydrogen ions in a solution is known as its PH. This value gives as indication of the acidity or alkalinity of a substance.
2. The PH value can be determined by the use of indicators, such as universal indicator paper, which contain compounds that change colour over a certain PH range.
3.A PH value may fall anywhere on a scale from 0 to 14, with a value of 7 representing neutrality
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