For the dissolving of Co(OH)3, the equilibrium constant expression, Ksp, is Question 7Select one:Ksp = [Co3+] [OH-]3Ksp = [Co3+] [OH-]Ksp = [Co(OH)3] / ([Co3+] [OH-]3) Ksp = [Co3+] [OH-] / [Co(OH)3]Ksp = [Co3+] [OH-]3 / [Co(OH)3]
Question
For the dissolving of Co(OH)3, the equilibrium constant expression, Ksp, is Question 7Select one:Ksp = [Co3+] [OH-]3Ksp = [Co3+] [OH-]Ksp = [Co(OH)3] / ([Co3+] [OH-]3) Ksp = [Co3+] [OH-] / [Co(OH)3]Ksp = [Co3+] [OH-]3 / [Co(OH)3]
Solution
The correct answer is: Ksp = [Co3+] [OH-]^3.
Here's why:
The solubility product constant, Ksp, is used to describe the equilibrium between a solid and its constituent ions in a solution. The expression for Ksp is the product of the concentrations of the ions, each raised to the power of its stoichiometric coefficient in the balanced chemical equation.
For the dissolution of Co(OH)3, the balanced chemical equation is:
Co(OH)3 (s) ⇌ Co3+ (aq) + 3OH- (aq)
From this equation, we can see that for every one molecule of Co(OH)3 that dissolves, one Co3+ ion and three OH- ions are produced. Therefore, the expression for Ksp is:
Ksp = [Co3+] [OH-]^3
This means that the Ksp is equal to the concentration of Co3+ ions times the concentration of OH- ions cubed.
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