Which reaction occurs at the platinum cathode of the Clark electrode?
a. CO2 + H2O ? H2CO3 ? H+ + HCO3–
b. AgCl + KCl ? Ag2 + Cl2 + K
c. O2 + 2H2O + 4e– ? 4OH–
d. 4Ag ? 4Ag+ + 4e–
ANS: C
Oxygen from the blood sample diffuses across the semipermeable plastic membrane into the KCl solution and reacts with the platinum cathode, altering the conductivity of the electrolyte solu-tion. The platinum cathode donates electrons, which reduce oxygen to produce hydroxyl ions.
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