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Acid-Base Titration
The process of adding a strong acid or a strong base
to a titrate of acid or base with the purpose of
neutralizing the substance in the beaker
+ -
Looking to reach equivalence point mol H = mol OH
Acid-Base Titration
Generally done with a pH probe, which is used to
create a graph of pH vs. volume added
H
p
Volume added
Determination of the Equivalence
Point
Ways to find the equivalence point
1. Can find it stoichiometrically using stoichiometry for the
neutralization reaction
+ -
mol H = mol OH stoichiometrically
Determination of the Equivalence
Point
Ways to find the equivalence point
2. Can find it graphically based on pH vs. volume graph
When the titrate is neutralized completely by the titrant,
the pH changes dramatically
The midpoint of this dramatic change is the equivalence
point – the middle of the area where neutralization is
happening
Use of an Acid-Base Indicator
• If the pH at the equivalence point is known, an
indicator can be used
• Want the pKa of the indicator to match the pH at the
equivalence point
• Indicator will then change color as pH changes
dramatically, giving visual end to the titration
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