Answer
Hydrogen carbonate ion and carbonate ion are capable of making a buffer with this hydronium ion concentration.
Work Step by Step
1. Calculate the pH Value
$pH = -log[H_3O^+]$
$pH = -log( 6 \times 10^{- 11})$
$pH = 10.22$
2. Using the Table 15.1, identify the conjugate pair with $pKa$ closest to $10.22$
- Hydrogen carbonate ion and carbonate ion: $10.33$
** Remember, this difference must be lower than 1, because this is approximately the pH range of a buffer solution.
