Question

1- The bauxite is treated with moderately concentrated sodium hydroxide at temperatures of between 140 and 240°C, and pressures of up to 35 atmospheres. Why does the pressure have to be so high? 2- Assuming that the aluminium oxide in the ore reacts with the sodium hydroxide to form sodium tetrahydroxoaluminate solution, write the equation for the reaction. 3- What happens to other compounds in the bauxite like iron(III) oxide? 4- How is the sodium tetrahydroxoaluminate solution converted into aluminium oxide? 5- The waste product from this process is "red mud". Why is it red?

Answer 1

Answer:

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