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This document describes a procedure to determine the titratable acidity of milk using a sodium hydroxide solution and the pH indicator phenolphthalein. 20 grams of milk are weighed and titrated with the alkaline solution until the color of the indicator changes to pink, which allows calculating the acidity as a percentage of lactic acid. The measured acidity of the milk was 0.144%, which is within the acceptable range, indicating good quality. It is recommended

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