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Acid-Base Titrations

AP Chemistry· difficulty 3/5

Weak acid (initial 0.10 M) titrated with NaOH; pH at equivalence ~ 9.

mL NaOH pH buffer region half-eq eq pt

Why is the pH at the equivalence point greater than 7?

  • A

    Indicator influences pH

  • B

    Excess strong base remains

  • C

    Strong acid cannot fully ionize

  • D

    Conjugate base A- hydrolyzes water to produce OH-

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Explanation

At equivalence, only the conjugate base A- is present in solution. A- + H2O <-> HA + OH- raises pH above 7.

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