Aluminum hydroxide is a substance that is insoluble in water and will form precipitates in this reaction. The complete reaction equation and net ionic equations are as follows:
Al(NO₃)₃(aq) + 3NaOH(aq) → Al(OH)₃(s) + 3NaNO₃(aq)
Al⁺³(aq) + 3OH⁻(aq) → Al(OH)₃(s)