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J. W. Hill, R. H. Petrucci, T. W. McCreary, & S. S. Perry General Chemistry 4th edition

Problem 16.24

The Ksp values of CuCO3 and ZnCO3 are 1.4×10–10 and 1.4×10–11, respectively. Does this mean that CuCO3 has ten times the solubility of ZnCO3? Explain.






Answer:

Although the equilibrium constants differ by a factor of ten, the solubilities of each compound do not differ by a factor of ten. The solubility of a compound is determined from the value of Ksp and the stoichiometry of the ionization reaction. In this case, the solubilities of the two compounds differ by about a factor of 3.2.