For each substance listed below explain its significance in the extraction of Aluminium
(b) Sodium hydroxide

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Solution

Sodium hydroxide $(NaOH)$ is used in the purification of Bauxite $(A l_{2} O_{3} . 2 H_{2} O)$ via the Baeyer’s process.
It dissolves bauxite and forms Sodium meta aluminate $(N a A l O_{2}) .$ This removes the insoluble impurities from $A l_{2} O_{3}$ by the formation of red mud.

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