Effect of caustic soda on aluminium hydroxide
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Effect of caustic soda on aluminium hydroxide is this : A layer of aluminum oxide previously formed by passive corrosion is dissolved by the addition of sodium hydroxide. For this reason, the reaction takes place at the beginning relatively slowly:
Al2O3 + 2 NaOH + 3 H2O > 2 Na+ + 2 [Al(OH)4]-
Al2O3 + 2 NaOH + 3 H2O > 2 Na+ + 2 [Al(OH)4]-
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Explanation:
Caustic soda is sodium hydroxide which is a strong base and so it has high basicity value on pH scale. It is widely used in acid-base titrations to neutralize various strong or weak acids like sulfuric acid.
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