Can aluminium hydroxide be split into Al 3+ and OH-?
Aluminum hydroxide has poor solubility in water (solubility product $3 \times 10^{-34}$).

However, $\ce{Al(OH)3}$ is amphoteric and soluble in acids and bases. An excess of $\ce{OH-}$ will form tetrahydroxidoaluminate:

$\ce{Al(OH)3 + OH- &lt;=&gt; [Al(OH)4]-}$