## Chemistry: Atoms First (2nd Edition)

$[OH^-] = 1.82\times 10^{- 6}M$ $[H_3O^+] = 5.495\times 10^{- 9}M$ pH = 8.26 - The solution is basic.
1. Calculate the hydroxide concentration: $[OH^-] = 10^{-pOH}$ $[OH^-] = 10^{- 5.74}$ $[OH^-] = 1.82 \times 10^{- 6}$ 2. Calculate the pH, then the hydronium concentration: pOH + pH = 14 5.74 + pH = 14 pH = 8.26 $[H_3O^+] = 10^{- 8.26}$ $[H_3O^+] = 5.495 \times 10^{- 9}$ - Since $[OH^-] > [H_3O^+]$, this solution is basic.