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What is the Ka value of acetic acid from the pH of the buffered solution? pH=4.39 of 25ml of HC2H3O2 with .410g NaC2H3O2 added.
Ka = [H3O][C2H3O2] / [HC2H3O2]

  • CHEM 111 - ,

    Use the Henderson-Hasselbalch equation.
    pH = pKa + log[(base)/(acid)]
    Solve for pKa and convert to Ka.

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