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The Measurement of Titratable Acidity (TA)Introduction
- Titratable acidity is an approximation for total acidity.
- The titratable acidity of a solution is measured by reacting the acids present with a base such as sodium hydroxide(NaOH) (see equation) to a chosen end point, as indicated by an pH colour indicator or by a pH meter.
- This is performed by securing a representative, prepared sample of grape juice or wine and pipetting an accurate quantity (10 ml) of this sample into a 100 ml beaker or conical flask .
- Added to this accurately measured sample are a few drops of pH indicator solution (phenolphthalein soln.) if not using a pH meter.
- This solution is then titrated to a persistent pink end point or a pH of 3.85, using a 0.1 M sodium hydroxide (NaOH) solution, delivered by a 25 ml or 50ml burette.
- The volume of NaOH solution required is recorded and the titratable acidity calculated.