## Chemistry: The Molecular Science (5th Edition)

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.