An equation that relates the pH of a buffer for different concentrations of conjugate acid and base:
or
And thank you wikipedia for making it easy to see how it relates to things we've already learned:
(Note: I know wikipedia is shunned for it's user contributed content, but every wikipedia article has a detailed list of linked references at the bottom of the page that can be checked to verify that an article's content isn't just made up bullshit. When in doubt, check references.)
Also note that this equation only works when the approximation method holds, when Ca / Ka is greater than 100.
Very useful information. I also found a good way to measure pKa of bases and acids which might help some readers.
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