In the leaching method,bauxite ore is digeste | vedclass

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(A) In the Bayer's process for leaching bauxite $(Al_2O_3 \cdot 2H_2O)$,the ore is treated with concentrated $NaOH$ solution at $473-523 \ K$ and $35-

Vedclass · Accepted Answer

$Na[Al(OH)_4]$ and $Al_2O_3 \cdot xH_2O$

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(A) In the Bayer's process for leaching bauxite $(Al_2O_3 \cdot 2H_2O)$,the ore is treated with concentrated $NaOH$ solution at $473-523 \ K$ and $35-36 \ bar$ pressure.$Al_2O_3 \cdot 2H_2O(s) + 2NaOH(aq) + H_2O(l) 	o 2Na[Al(OH)_4](aq)$Here,$X$ is sodium tetrahydroxoaluminate,$Na[Al(OH)_4]$.When $CO_2$ gas is passed through this solution,$Al(OH)_3$ precipitates out,which on heating gives hydrated alumina $(Al_2O_3 \cdot xH_2O)$.$2Na[Al(OH)_4](aq) + 2CO_2(g) 	o 2Al(OH)_3(s) + 2NaHCO_3(aq)$$2Al(OH)_3(s) \xrightarrow{\Delta} Al_2O_3 \cdot xH_2O(s) + (3-x)H_2O$Thus,$X$ is $Na[Al(OH)_4]$ and $Y$ is $Al_2O_3 \cdot xH_2O$.

In the leaching method,bauxite ore is digested with a concentrated solution of $NaOH$ that produces $X$. When $CO_2$ gas is passed through the aqueous solution of $X$,a hydrated compound $Y$ is precipitated. $X$ and $Y$ respectively are

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