Hydroxide of aluminimum is more acidic than the hydroxide of boron Hydroxide of boron is basic while the hydroxide of aluminium is amphoteric. Hydroxide of aluminium is amphoteric since `Al-O` and `O-H` BONDS have NEARLY same ionic charcter Hydroxide of boron is acidic since it ionizes in WATER to `BO_(3)^(3-)` land `H^(+)` ions.