Posted by eric on Saturday, July 24, 2010 at 1:31pm.
You can do this one of two ways, both using the Henderson-Hasselbalch equation.
pH = pKa + log(base)/(acid).
You CAN simply substitute 60 for base and 40 for acid and solve OR, if that is a little confusing, you can assume some convenient volume of acetic acid (say 50 mL or something like that), neutralize 60% of that, calculate base concn and acid concn and substitute. The fraction will always turn out to be 6/4 for the 60/40 ratio.
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