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(C) In the Bayer's process for the extraction of aluminum from bauxite,the powdered ore is digested with a concentrated solution of $NaOH$ at $473 - 5

Vedclass · Accepted Answer

Sodium aluminate,Sodium silicate

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(C) In the Bayer's process for the extraction of aluminum from bauxite,the powdered ore is digested with a concentrated solution of $NaOH$ at $473 - 523 \ K$ and $35 - 36 \ bar$ pressure.$Al_2O_3 \cdot 2H_2O + 2NaOH \rightarrow 2NaAlO_2 + 3H_2O$$SiO_2 + 2NaOH \rightarrow Na_2SiO_3 + H_2O$Here,$Al_2O_3$ (alumina) dissolves to form sodium aluminate $(NaAlO_2)$ and silica $(SiO_2)$ dissolves to form sodium silicate $(Na_2SiO_3)$.Both are soluble in the reaction mixture.

Which soluble substances are obtained when bauxite is treated with a solution of $NaOH$ at a temperature of $473 - 523 \ K$ and a pressure of $35 - 36 \ bar$?

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