Who came up with the PH scale?

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    In 1909, Danish chemist Soren Peder Lauritz Sorenson initiated the concept of the pH scale. The H in pH was used to describe the concentration of hydrogen ions, or acidity in a solution. The scale was later revised in 1924, when it became clear that hydrogen ion concentration did not in fact contribute to a solution’s acidity, rather, electromotive force was the indicator.

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