According to the Henderson-Hasselbalch equation, the pH of the blood will be normal as long as the ratio of HCO3– to dissolved CO2 is which of the following?

a. 10:1
b. 20:1
c. 24:1
d. 30:1

ANS: B
Note that the pH is determined by the ratio of [HCO3–] to dissolved CO2, rather than by the ab-solute values of these components. As long as the ratio of HCO3– buffer to dissolved CO2 is 20:1, the pH is normal, or 7.40.

Health Professions

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