Which of the Following is a Buffer Pair

Question

Which of the following is a buffer pair? A) PTH, aldosterone B) ADH, ANF C) HCO3^-, H2CO3 D) Sodium, potassium

Accepted Answer

The pair HCO₃^- and H₂CO₃ is a buffer pair because they represent the conjugate acid-base pair of a weak acid (HCO₃^-) and its corresponding weak base (H₂CO₃). This means that they are able to resist changes in pH when an acid or base is added to the solution, making it a buffer pair. The other choices do not represent a conjugate acid-base pair or do not have buffering properties.