Abstract
THE symbols pH and pK, commonly encountered in chemical literature, each consist of two letters, the second of which may, or may not, be used as a subscript, and either or both of which may be set alternatively in roman type or in italics. There appears to be no generally accepted convention governing the choice from the many resulting possible forms, and inconsistencies are often encountered even within a single published article.
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CLIBBENS, D. Symbols Used to Indicate Hydrogen Ion Concentration and Similar Quantities. Nature 156, 176 (1945). https://doi.org/10.1038/156176a0
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DOI: https://doi.org/10.1038/156176a0
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