Acidity
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
This article defines the acidity of solutions as a complex concept characterized by three distinct factors: active reaction, titratable acidity, and buffer properties. It emphasizes that all three must be considered together to fully characterize the acidity of a solution.
Encyclopedia entry (1928–1936)
ACIDITY of solutions, according to modern concepts of physical chemistry, is a complex concept characterized by three values: 1) active reaction (see), 2) titratable acidity (see Alkalimetry), 3) their buffer properties (see). Solutions having the same active reaction may differ in their titratable acidity and their buffer properties. Only all the above-noted values, taken together, make it possible to fully characterize the acidity of a solution. Regarding the acidity of gastric juice—see Stomach, and also Hydrogen ions.
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“Acidity.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.com/article/acidity/