## Chemistry: Molecular Approach (4th Edition)

(a) $CH{O_2}^-$ is a weak base. (b) $Cl{O_4}^-$ is a pH-neutral anion.
1. Identify the conjugate acid. (a) $HCHO_2$ (b) $HClO_4$ 2. Determine if the conjugate acid is strong or weak. (a) According to table 16.5, $HCHO_2$ is a weak acid. (b) According to table 16.3, $HClO_4$ is a strong acid. 3. If the conjugate acid is weak, the anion is a weak base; if the conjugate acid is strong, the anion is pH-neutral.