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ormal metabolic processes produce significant amounts of acid, sometimes up to 10 \rm mol/day, in the human body. Thus it is desirable that the buffer system for blood contain more conjugate base than acid.
Which conjugate acid-base pair is most responsible for maintaining the \rm pH of blood?
a. \rm \frac {[{PO_4}^{3-}]}{[{HPO_4}^{2-}]}.
b. \rm \frac {[{HCO_3}^{-}]}{[H_2CO_3]}.
c. \rm \frac {[{HPO_4}^{2-}]}{[{H_2PO_4}^{-}]}.
d. \rm \frac {[{CO_3}^{2-}]}{[{HCO_3}^-]}.
e. \rm \frac {[{H_2PO_4}^{-}]}{[H_3PO_4]}.

Respuesta :

Answer:

The correct option is: b. \rm \frac {[{HCO_3}^{-}]}{[H_2CO_3]}

Explanation:

Blood is an important body fluid that is pumped by the heart and circulated around the body through the blood vessels.

The pH range of the blood is 7.35 to 7.45, i.e. slightly basic. The blood pH should be regulated for the proper functioning of the human body.

The buffer system that helps in maintaining the pH of the human blood is the carbonic acid (H₂CO₃) - bicarbonate ion (HCO₃⁻) buffer system.

In thus system, the pH is balanced by the weak acid, H₂CO₃ and its conjugate base, HCO₃⁻. Therefore, H₂CO₃ and HCO₃⁻ are conjugate acid-base pair.

The buffer system in the blood that has been responsible for maintaining the pH of the blood during Ormal metabolism process has been [tex]\rm \dfrac {[{HCO_3}^{-}]}{[H_2CO_3]}.[/tex]

What is a buffer?

The buffer has been given as the system that resists the change in the pH of the solution with the addition of acid or base.

The blood has pH range slightly basic, and the acid produced changes the pH towards the basic side. Thus, the addition of slightly weaker acid in the solution results in resisting the change in pH.

The weaker acid system that has been able to resist the change in the pH has been [tex]\rm \dfrac {[{HCO_3}^{-}]}{[H_2CO_3]}[/tex]. Thus, option B is correct.

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