2BaCrO4↓ + 4HCl -> 2BaCl2 + H2Cr2O7 + H2O — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Identify starting materials: Barium chromate (BaCrO4↓) is an insoluble yellow precipitate. Step 2: Analyze the reaction with HCl: Hydrochloric acid provides H+ ions that convert the basic chromate ion (CrO4^2-) into dichromate (Cr2O7^2-), which forms a highly soluble barium salt, thereby dissolving the solid BaCrO4. Step 3: Because the insoluble precipitate dissolves to yield a clear orange-colored solution, this is a precipitate dissolution reaction (type B).