Sulphate of a metal ‘M’ (having amphoteric oxide) reacts with sodium hydroxide to form a white gelatinous precipitate. The chemical formula of the precipitate and metal ‘M’ respectively are
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Al(OH)₃ (or X) is the Gelatinous white precipitate, which will be soluble in the excess of the NaOH. When Aluminium hydroxide (or X) is further made to reacts with the Sodium hydroxide, it forms the Clear Solution of Sodium Aluminate.
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M is Al2O3
precipitate is sodium aluminate
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