3.4.2. Titratable Acidity (TA)

Five grams of fruit in 50 mL of distilled water were homogenized for each treatment. The acidity (citric acid %) was determined using potentiometric titration with 0.1 N NaOH, according to Equation (1):

where V₁ is the volume of NaOH used (mL), V₂ is the volume of the sample (mL), k is the equivalent weight of citric acid (0.064 g/meq), and N is the normality of NaOH (0.1 meq/mL).