Chemistry-Dr.Bob222

A 1.00 L buffer solution is 0.250 M in HC2H3O2 and 0.250 M in NaC2H3O2. Calculate the pH of the solution after the addition of 0.150 mol of solid NaOH. Assume no volume change upon the Additon o f NaOH. The Ka value for HC2H3O2 at 25 C is 1.8 x 10^-5.

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asked by Nevaeh
  1. HC2H3O2 = HAc
    NaC2H3O2 = NaAc
    millimols HAc = mL x M = approx 250
    mmols NaAc = 250
    0.150 mol NaOH = 150 mmol

    ......HAc + OH^- ==> Ac^- + H2O
    I.....250....0.......250.......
    add........150.................
    C...-150..-150.......+150
    E.....100...0........400

    Plug the E line into the HH equation and solve for pH.

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