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Maria Filomena Camões and Bárbara Anes
Free acidity of aqueous solutions was initially defined in 1909 by Søren Peter Lauritz Sørensen as pH = -lgcH+ (c/mol·dm-3 or m/mol·kg-1 of the free hydrogen ions in solution, H+) soon (1910) was changed to pH = paH+ = -lgaH+, integrating the new concept...
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