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Calculate the amount of calcium carbonate (mg) not in solution if a tablet is dissolved in...

Calculate the amount of calcium carbonate (mg) not in solution if a tablet is dissolved in 250 mL of water and the tablet's label claim is 600 mg/tablet. That source of calcium in the tablet is calcium carbonate.

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Expert Solution

The Ksp of calcium carbonate is 2.8x10-9. This mans that the maximum amount of Ca2+ and CO32- that can exist in solution in equilibrium with non-dissolved CaCO3 is given by:

Since both ions come from dissolved calcium carbonate, their concentrations are the same and are equal to the amount of dissolved carbonate:

So the concentration of dissolved carbonate is:

Then, the mass of calcium carbonate in the 250 mL of water that will be dissolved is:

This means that the non-dissolved mass will be:

queen_honey_blossom answered 2 years ago
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