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Titratable acidity & Total acidity in wine:
Total acidity: proton equivalence of the amount of organic acid anions present in a wine. It is the number of protons + dissociation.
Titratable acidity: number of protons recovered during a titration with a strong base to a specified endpoint. It can also be expressed as a molar quantity. Many people use titratable acidity and total acidity as synonyms, but they are not.
The titratable acidity is always less than the total acidity, because not all of the hydrogen ions expected from the acids are found during the determination of titratable acidity.
However, titratable acidity is easier to measure.
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