General Science • ChemistryHard
Which chemical equation correctly expresses the solubility product constant for sparingly soluble aluminum hydroxide (Al(OH)₃)?
A. Ksp = [Al3+][OH-]
B. Ksp = [Al3+][OH-]^3✓ Correct Answer
C. Ksp = [Al3+]^3[OH-]
D. Ksp = [Al(OH)3] / ([Al3+][OH-]^3)
💡 Solution & Explanation
The solubility product constant for aluminum hydroxide is expressed as the product of the molar concentrations of its constituent ions raised to powers equal to their stoichiometric coefficients in the dissociation equilibrium, yielding the cube of the hydroxide ion concentration. Monovalent or univalent products would misrepresent the ionic stoichiometry. Dividing undissociated solid concentrations is incorrect because solid phases maintain constant activity in heterogeneous equilibria.
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