chem

posted by larry

(a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 ∘C.

  1. DrBob222

    Hg = glycolic acid
    Hg = 0.2M x 50 mL = 10 mmols.
    KOH = 5mL x 0.25M = 1.25 mmols.
    .......Hg + OH^- ==> g^- H2O
    I......10...0........0....0
    added......1.25............
    C...-1.25.-1.25.....1.25
    E.....8.75..0.......1.25..1.25

    Use the Henderson-Hasselbalch equation, substitute and solve for pH.

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