2Na[Al(OH)4] + CO2 -> 2Al(OH)3↓ + Na2CO3 — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Identify the initial state. Sodium tetrahydroxoaluminate, Na[Al(OH)4], is a soluble complex that forms a clear solution in water. Step 2: Analyze the reaction with CO2. Bubbling carbon dioxide gas reduces the pH of the basic solution, decomposing the complex and forming insoluble aluminium hydroxide, Al(OH)3↓. Step 3: Since a solid precipitate (Al(OH)3↓) is formed from soluble species, this reaction is a precipitate formation reaction (type A). Thus, the correct option is (a).