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17.99 The solubility of CaCO3 is pH dependent. (a) Calculate the molar solubility of Caco, (K,,-4.5 × 10-9) neglecting the acid-base character of the carbonate ion. (b) Use the K expression for the CO, ion to determine the equilibrium constant for the reaction CaCO3(s) + H2O(1) (c) If we assume that the only sources of Ca2, HCO3, and OH ions are from the dissolution of CaCO3, what is the mo- lar solubility of CaCO, using the equilibrium expression from part (b)? (d) What is the molar solubility of CaCO; at the pH of the ocean (8.3)? (e) If the pH is buffered at 7.5, what is the molar solubility of CaCO3?
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