39) One of the buffers that contribute to pH stability in human blood is carbonic acid (H₂CO3). Carbonic acid is a weak acid that, when placed in an aqueous solution, dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+). (See figure.) H₂CO3 Carbonic acid HCO3 Bicarbonate ion H+ Hydrogen ion If the pH of blood drops, one would expect A) a decrease in the concentration of H2CO3 and an increase in the concentration of HCO3- B) the concentration of bicarbonate ions (HCO3-) to increase C) the HCO3- to act as a base and remove excess H+ by the formation of H2CO3 D) the HCO3- to act as an acid and remove excess H+ by the formation of H₂CO3 Answer: C

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