EOC buffer questions 17.25 and 17.26

[Zellmer, Robert]

I've received questions about EOC exercises 17.25 and 17.26 in the past.  These
are companion problems.  They're about adding the salt of the conjugate base of
a weak acid to a solution of the weak acid to make a buffer system. This is the
same as a common-ion problem (since buffers are special CI problems)

They're not as complicated as you might think from reading the question so don't
make them more complicated than necessary.  Solve for the conc. of the conj. base
using the expression for Ka for the acid, the [acid] and the [H+] you get from the pH.

I actually mentioned them in a e-mail sent earlier today.

Dr. Zellmer
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