A buffer pair (HA/A−) has a pK of 5.4. At a blood pH of 7.4, the concentration of HA is
ExplanationThe Henderson-Hasselbalch equation can be used to calculate the ratio of HA/A−:
pH = pK + log A−/HA
7.4 = 5.4 + log A−/HA
2.0 = log A−/HA
100 = A−/HA or HA/A− is 1/100
