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Calcium carbonate (e.g. from limestone) is relatively insoluble in water, and the solubility decreases with rising temperature. This is why CaCO3 precipitates out as ‘scale’ in hot water more readily than cold water. At a temperature of 20oC , calcium carbonate pKs = 8 . 8; at 35oC , pKs = 9 . 25. If you had water that was at equilibrium with excess calcium carbonate at 20oC and then raised the temperature to 35oC , what is the mass of CaCO3 that will precipitate out per litre of water? Hint: the difference in solubility will drive the reaction back to solid.           CaCO3 <-> Ca2+ + CO32-

Calcium carbonate (e.g. from limestone) is relatively insoluble in water, and the solubility decreases with rising temperature. This is why CaCO3 precipitates out as ‘scale’ in hot water more readily than cold water. At a temperature of 20oC , calcium carbonate pKs = 8 . 8; at 35oC , pKs = 9 . 25. If you had water that was at equilibrium with excess calcium carbonate at 20oC and then raised the temperature to 35oC , what is the mass of CaCO3 that will precipitate out per litre of water? Hint: the difference in solubility will drive the reaction back to solid.           CaCO3 <-> Ca2+ + CO32-

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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 Calcium carbonate (e.g. from limestone) is relatively insoluble in water, and the solubility
decreases with rising temperature. This is why CaCO3 precipitates out as ‘scale’ in hot water
more readily than cold water. At a temperature of 20oC , calcium carbonate pKs = 8 . 8; at
35oC , pKs = 9 . 25. If you had water that was at equilibrium with excess calcium carbonate at
20oC and then raised the temperature to 35oC , what is the mass of CaCO3 that will precipitate
out per litre of water? Hint: the difference in solubility will drive the reaction back to solid.

          CaCO3 <-> Ca2+ + CO32-

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