Why [Al(OH)₄]^- is neutral? Why its not a base?

Dear Student,

Please find below the solution to the asked query:

Al(OH)₃ is an amphoteric hydroxide. When it is treated with a strong base like NaOH, it acts like a weak acid and dissolves.

$\mathrm{Al}{\left(\mathrm{OH}\right)}_3\left(\mathrm{s}\right) + {\mathrm{OH}}^{-}\left(\mathrm{aq}\right) \to \mathrm{Al}{\left(\mathrm{OH}\right)}_4^{-}\left(\mathrm{aq}\right)$

Thus, [Al(OH)₄]⁻ is not neutral. Rather, it is the conjugate base.

Hope this information will clear your doubts.

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