Given the following conjugate acid-base pairs and their Ka values at 25°C, which of the following acid-base buffer systems might be found in the human body?
Choose one or more:
H2PO41- / HPO42- ; Ka = 6.4x10-8
HF /F - ; Ka = 6.8×10-4
H2CO3/HCO3- ; Ka = 4.3x10-7
HCl O2/Cl O2- ; Ka = 1.10×10-2
HIO /IO - ; Ka = 2.30×10-11
CH2I COOH/CH2I COO- ; Ka = 7.60×10-4
HCO3-/CO32- ; Ka = 4.7x10-11
C6H5COO H/C6H5COO - ; Ka = 6.20×10-5
H3PO4/H2PO42- ; Ka = 6.9x10-3