How To Calculate Pka From Ph Graph

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pKa from pH Graph Calculator: Determine Acid Strength \n\n\n\n
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pKa from pH Graph Calculator

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Determine the pKa of an acid from its pH titration curve. This calculator finds pKa at the half-equivalence point where pH = pKa.

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Calculated pKa

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At the half-equivalence point, pH = pKa.

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Enter values and click 'Calculate' to find pKa.

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Common pH Values and pKa Equivalents

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pHpKa (Equiv.)Acid Strength
2.02.0Strong Acid
3.03.0Moderately Weak Acid
4.764.76Acetic Acid (Weak)
7.07.0Neutral (Water)
9.259.25Ammonia (Weak Base)
12.012.0Strong Base
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How to Determine pKa from a pH Graph

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The Fundamental Relationship: At the half-equivalence point of a titration, exactly half of the acid has been neutralized. This means:

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  • [HA] = [A⁻]
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  • Henderson-Hasselbalch equation simplifies: pH = pKa + log(1) = pKa
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Steps to Find pKa:

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  1. Plot the titration curve (Volume vs. pH).
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  2. Locate the equivalence point (midpoint of steepest rise).
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  3. Divide the equivalence volume by 2 to find the half-equivalence volume.
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  4. Read the pH at that exact volume on the graph.
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  5. That pH value is your pKa.
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