A Popular Buffer Solution Consists of Carbonate (CO₃^2-) and Hydrogen

Multiple Choice

A popular buffer solution consists of carbonate (CO₃^2-) and hydrogen carbonate (HCO₃^-) conjugate acid-base pair. Which, if any, of the following such buffers can neutralize the greatest amount of added hydrochloric acid, while remaining within its buffer range?

A) 1 L of 0.9 M CO₃^2- and 0.1 M HCO₃^-
B) 1 L of 0.1 M CO₃^2- and 0.9 M HCO₃^-
C) 1 L of 0.5 M CO₃^2- and 0.5 M HCO₃^-
D) 1 L of 0.1 M CO₃^2- and 0.1 M HCO₃^-
E) They can all neutralize the same amount of hydrochloric acid.