(Solution) - An antacid tablet has calcium carbonate as the active ingredient -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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An antacid tablet has calcium carbonate as the active ingredient; other ingredients include a starch binder. You dissolve the tablet in hydrochloric acid and filter off insoluble material. You add potassium oxalate to the filtrate (containing calcium ion) to precipitate calcium oxalate. If a tablet weighing 0.680 g gave 0.629 g of calcium oxalate, what is the mass percentage of active ingredient in the tablet?