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CaptainZappo
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Homework Statement
What is the pH of the resulting solution when 100.0 mL of 0.10 M H3PO4 is mixed with 200.0 mL of 0.15 M NaOH?
Homework Equations
Henderson-Hasselbalch, equilibrium constant expressions
The Attempt at a Solution
I've thought about this question for over an hour, yet I have still gotten nowhere. I eventually came to the conclusion that the excess number of moles of OH- will dominate. Based on this conclusion, I calculated a pH of 12.82. However, this answer was marked wrong.
Can anyone lend some insight into this situation?