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the definition of pH is a measurement of bases and acids. potential of hydrogen ion concentration potential of hydrogen ion concentration Every water solution contains H+ ions. Their concentration is one of the most important parameters describing solution properties. Concentrations of H+ can change in a very wide range, it can be 10 M as well as 10-15 M. Such numbers are inconvenient to use so to simplify things Danish biochemist Søren Sørensen developed in 1909 the pH scale and introduced pH definition - minus logarithm base 10 of [H+]:

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