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Chemistry

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A buffer solution is prepared by dissolving 0.400 mol of CH3COOH and 0.200 mol of CH3COONa in 1.00 L of water. 1.00 mL of 10.0 M HCl is added to a 100 mL portion of this solution. What is the final pH of the resulting solution?
Ka of CH3COOH = 1.8 x 10¯5

  • Chemistry -

    You want to make an ICE chart and use the Henderson-Hasselbalch equation.
    Let's simply our typing by calling CH3COOH just HAc and CH3COONa will be NaAc.
    mmoles HAc = 0.400 M x 100 mL = 40.0
    mmoles Ac^- = 0.200M x 100 mL = 20.0
    mmoles HCl added = 1.00 mL x 10.0 M = 10.0

    ...............Ac^- + HCl ==> HAc + Cl^-
    initial.......20.0.....0......40.0
    added................10.0..........
    change.......-10.0...-10.0.....+10.0
    equil.........10.0....0.........+50.0
    Now plug all of that into the HH equation and solve for pH. Post your work if you get stuck.

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