Chemistry

posted by Jaden

A buffer is made by mixing 100 mL of 0.25 M acetic acid (CH3COOH) and 150 mL of 0.10 M sodium acetate (CH3COONa). Calculate the pH of the solution after 0.5g of solid NaOH is added to the solution (Given Ka (CH3COOH) =1.8 x 10-5)

  1. DrBob222

    millimols HAc (CH3COOH) = mL x M = 25
    mmols NaAc(CH3COONa) = 15
    mmols NaOH = mg/molar mass = 12.5
    ----------------------------

    .......HAc + OH^- ==> Ac^- + H2O
    I......25....0.......15........
    add.........12.5...................
    C...-12.5..-12.5.....12.5.........
    E.....12.5...0.......27.5

    Substitute the E line into the Henderson-Hasselbalch equation and calculate pH.

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