Department of Chemistry and Chemical Biology

PPT Slide

    Acid-Base Titrations

    Strong Acid-Base Titrations
  • We know the pH at equivalent point is 7.00.
  • To detect the equivalent point, we use an indicator that changes color somewhere near 7.00.
    • Usually, we use phenolphthalein that changes color between pH 8.3 to 10.0.
    • In acid, phenolphthalein is colorless.
    • As NaOH is added, there is a slight pink color at the addition point.
    • When the flask is swirled and the reagents mixed, the pink color disappears.
    • At the end point, the solution is light pink.
    • If more base is added, the solution turns darker pink.

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Last modified: Tuesday, April 01, 2003