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Acid-Base Titrations

AP Chemistry· difficulty 4/5

Diprotic acid titration with NaOH. eq 1 ~ pH 4, eq 2 ~ pH 9.

mL NaOH pH pH ~ 4 (eq 1) pH ~ 9 (eq 2)

Which indicator is best for detecting the SECOND equivalence point?

  • A

    Methyl orange (pH 3.1-4.4)

  • B

    Methyl red (pH 4.4-6.2)

  • C

    Bromothymol blue (pH 6.0-7.6)

  • D

    Phenolphthalein (pH 8.2-10.0)

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Explanation

The second equivalence pH ~ 9 falls within phenolphthalein's color-change range, making it the appropriate indicator.

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