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How is pure alumina recovered from sodium aluminate solution?

Expert Answer

By passing $CO_2$ gas to precipitate hydrated $Al_2O_3$ : $2Na[Al(OH)_4](aq) + CO_2(g) \rightarrow Al_2O_3 \cdot xH_2O(s) + 2NaHCO_3(aq)$ .

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