A solution contains 2.89E-8 M Cr3+(aq) and 5.68E-8 M OH- (aq). Will a precipitate form? The Ksp for Chromium (III) Hydroxide is 1.60E-30 M4.

Question

matt101 · Answer

Calculate Q for the given concentrations. If Q > Ksp, a precipitate will form. If Q < Ksp, a precipitate will not form.

anonymous · Answer

@matt101 How would i calculate Q???

matt101 · Answer

Same equation as you would use for calculating Ksp. Q is just a "test" value to see where your given concentrations are relative to equilibrium. If you are at equilibrium, Q=Ksp. If you aren't, Q will be bigger or smaller than Ksp, depending on which side of the equilibrium you're on.