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

Review Question 16.1

Write the solubility product constant expression for equilibrium in a saturated solution of (a) iron(III) hydroxide and (b) gold(III) oxalate.

Fe(OH)3(s) Fe3+(aq) + 3 OH(aq)

Au2(C2O4)3(s)2 Au3+(aq) + 3 C2O42–(aq)






Answer:

Solids do not contribute to mass action expressions, so the solubility product constant is

(a) Ksp = [Fe3+]e[OH]e3

(b) Ksp = [Au3+]e2[C2O42–]e3