The Henderson-Hasselbalch equation is used in acid-base analysis to relate which of the follow-ing?
a. pH to PCO2 c. Carbonic acid (H2CO3) to HCO3–
b. pH to bicarbonate (HCO3–) d. PO2 to oxygen sat-uration
ANS: B
A modified version of the Henderson-Hasselbalch equation is used in the PCO2 electrode to relate the pH measured to the PCO2 of the blood. Therefore, the PCO2 is determined as a function of the change in pH of the bicarbonate solution in the PCO2 electrode.
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