We’re being asked to determine if a precipitate will form when combining solutions 1.0 x 10-10 M Al(NO3)3 and 2.0 10-8 M NaOH with Al(OH)3 as the expected precipitate.
We will use the reaction quotient, Q, to determine if the chemical reaction would be at equilibrium or not. The formula for Q is:
For this, we need to compare the reaction quotient (Q) vs. the solubility product constant (Ksp).
Recall that when:
• Q > Ksp: the solution is supersaturated and a precipitate will form. Reactants are favored.
• Q = Ksp: the solution is at equilibrium and no precipitate will form.
• Q < Ksp: the solution is unsaturated and no precipitate will form. Products are favored.
The Ksp of Al(OH)3 at 25 °C is 1 x 10-33. Consider a solution that is 1.0 x 10-10 M Al(NO3)3 and 2.0 10-8 M NaOH.
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