Bauxite is dissolved in excess sodium hydroxide in the production of aluminum through the Bayer process. This process involves dissolving bauxite ore in sodium hydroxide solution to extract alumina (aluminum oxide).
Excess sodium hydroxide is used because it helps to dissolve the entire bauxite ore and maintains the pH of the solution at a high alkaline level, which is necessary for the extraction of alumina. The high pH conditions prevent the precipitation of impurities such as iron and silicon, ensuring a more efficient extraction process.
Additionally, excess sodium hydroxide reacts with aluminum hydroxide to form sodium aluminate, which is soluble in water. This allows for the separation of alumina from the insoluble impurities present in bauxite ore.
Overall, dissolving bauxite in excess sodium hydroxide helps to extract alumina efficiently and effectively in the production of aluminum.
Why is bauxite dissolved in excess sodium hydroxide
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