Aluminium sulphate reacts with sodium hydroxide to from a precipitate hydroxide while the solution after the reaction is found to contain sodium suiphate.

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Solution

$A l_{2} (S O_{4})_{3} + N a O H ⟶ 2 A l (O H)_{3} + 3 N a_{2} S O_{4}$

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Aluminium sulphate reacts with sodium hydroxide to from a precipitate hydroxide while the solution after the reaction is found to contain sodium suiphate.

Al2(SO4)3+NaOH⟶2Al(OH)3+3Na2SO4

$A l_{2} (S O_{4})_{3} + N a O H ⟶ 2 A l (O H)_{3} + 3 N a_{2} S O_{4}$