Chapter 17 Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria - Study Questions - Page 677c: 70

Yes.

$[Mg^2+]=0.10\ M\times 75\ mL/(75+25)\ mL=0.075\ M$ $[OH^-]=0.010\ M\times 25\ mL/(75+25)\ mL=0.0025\ M$ $Qsp=[Mg^{2+}][OH^-]^2$ $Qsp=0.075\dot{}0.0025^2=6.25\dot{}10^{-6}>Ksp=5.6\dot{}10^{-12}$ Since Qsp is bigger than Ksp, precipitation will occur.