Titration EquivalenceChemistry

Acid-Base Titration Equivalence Point & Curve Calculator

Calculate equivalence volume (Ve), half-equivalence point buffer pH (pH = pKa), and hydrolytic equivalence point pH for weak acid-strong base titrations.

Calculated Result

Equivalence Point Volume (Ve)

25L

Calculator Inputs

M
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M
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-
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Equivalence Point Volume (Ve)

25L

Equivalence Point pH

14 pH

Half-Equivalence Volume

12.5 L

Half-Equivalence pH (= pKa)

4.76 pH

Basic Equivalence Point (pH > 7): Typical for weak acid titrations; phenolphthalein (range 8.2 - 10) is the recommended analytical indicator.

Titration Volume and pH Transition Profile

Equiv Vol Ve
25 mL(64%)
Equiv pH
14 pH(36%)

Standard quantitative analytical chemistry tool for volumetric titration modeling and indicator selection.

Calculation Methodology

Equivalence Volume: Ve = (Ca * Va) / Cb. Half-Equivalence Point: V_half = Ve / 2 where pH = pKa. Equivalence Point: Conjugate base concentration C_eq = (Ca * Va) / (Va + Ve); pH calculated via Kb hydrolysis.

Frequently Asked Questions

At 50% titration, exactly half of the initial weak acid is converted to conjugate base, setting [A-] / [HA] = 1.0, which makes log(1) = 0 in the Henderson-Hasselbalch equation.

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