Answer
$CH_3COO^-$ is a weak base.
Work Step by Step
Compounds with the $-COO^-$ group are, most of the time, weak bases.
You can also analyze table $14.2$ (Page 624), and see that, $CH_3COO^-$ has $K_b = 5.6 \times 10^{-10}.$
Compounds with $K_b < 1$, are considered weak bases.
