Posted by Sandy on Sunday, June 26, 2011 at 11:34pm.
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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