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Posted by on Sunday, December 5, 2010 at 3:22pm.

How many moles of NaOH must be added to 1.0 L of 1.4 M HC2H3O2 to produce a solution buffered at each pH?
(a) pH = pKa mol
(b) pH = 3.07 mol
(c) pH = 5.15 mol

  • Chemistry - , Sunday, December 5, 2010 at 5:00pm

    Use the Henderson-Hasselbalch equation.
    First find moles acetic acid. M x L = moles.
    .......CH3COOH + OH^- ==>CH3COONa + H2O
    start...moles.... 0.......0
    change..-x........+x........+x
    final..moles-x.....0......0+x

    Then substitute into the HH equation and solve for x. After, I always like to check it by calculating the moles acetate and moles acetic acid remaining, plug into the HH equation and see if it gives the correct pH.

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