AP Chemistrymediummcq1 pt
What is the pH of a buffer with 0.20 M HAc and 0.10 M NaAc? (pKa = 4.74)
A.4.44
B.5.04
C.4.74
D.4.60
Explanation
Core Concept
pH = pKa + log([A⁻]/[HA]) = 4.74 + log(0.10/0.20) = 4.74 − 0.30 = 4.44.
Correct Answer
A4.44
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