Posted by Amanda on Thursday, May 24, 2012 at 12:42am.
Use the Henderson-Hasselbalch equation.
4.5 = 4.74 + log(b)/(a)
Solve for B/A.
You know acid is 300 mL x 0.1M = 30 millimoles.
Solve for base in millimoles. I would then convert to mols and from the to grams.
Finally, put all of that back into the equation to check that you really do get a pH of 4.5.
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