The 1/2 equivalence point is defined as the point at which 1/2 of the volume needed to reach the equivalence point has been added in a weak acid or weak base titration. Also at the 1/2 equivalence point, the pH = pKa of the weak acid or weak base (p = - log). When titrating acetic acid with potassium hydroxide, it took 19.24 mL of KOH to reach the equivalence point, where the pH was determined to be 8.58. The volume needed to reach the 1/2 equivalence point is

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.