What is the reaction of freshly precipitated aluminum hydroxide with caustic soda solution? Give equation.

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Solution

When the freshly precipitated aluminium hydroxide reacts with the caustic soda solution, a white salt of sodium meta-aluminate is obtained along with the formation of water.
The equation of the reaction is given below:
$Al (OH)_{3} + NaOH \overset{Δ}{⟶} {NaAlO}_{2} + 2 H_{2} O Sodium meta - aluminate (soluble)$

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