H+] can be determined by the use of which factors? 1. HCO3– 2. H2CO3 3. Inorganic phosphorus 4. PaO2
a. 1, 2, and 3 only
b. 2 and 3 only
c. 4 only
d. 1 and 2 only
ANS: D
[H+] = (KA ⋅ [H2CO3])/[HCO3–]
Thus, [H+] is determined by the ratio between undissociated acid molecules [H2CO3] and base anions [HCO3–].
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