Problem: If a buffer solution is 0.140 M in a weak acid (K_a = 8.1 times 10^-5) and 0.450 M in its conjugate base, what is the pH?

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If a buffer solution is 0.140 M in a weak acid (K_a = 8.1 times 10^-5) and 0.450 M in its conjugate base, what is the pH?