Question

A buffer is formed by adding 500 ml of 0.20 M correct to 500 mL of 0.10 M NaC H$_2$O$_2$. What would be the maximum amount of HCl that could be added to this solution without exceeding the capacity of the buffer?

• A. 0.01 mol
• B. 0.05 mol
• C. 0.10 mol
• D. 0.15 mol

Hint:

Buffer capacity is the ability to resist changes in pH, and it is greatest when the concentrations of the acid and its conjugate base are nearly equal.

Answer 1

The Correct Option is C

To determine the maximum amount of HCl that can be added without exceeding the buffer capacity, we use the relationship between the buffer capacity and the amounts of acid and base in the solution. The buffer is most effective when the concentrations of the acid and conjugate base are nearly equal, so the maximum amount of HCl added would be 0.10 mol.