1. You are provided with an aqueous solution containing 0.050 M Mg2+ and 0.050 M Cu2+ ions and are asked to try to separate them. What concentration of OH- is needed to begin precipitation of each cation? Ksp = 1.8 x 10-11 for Mg(OH)2; Ksp = 4.8 x 10-20 for Cu(OH)2.
2. Calculate how many mL of a 0.1 M NaOH solution was added to a titration mixture of 100 mL of 0.1 M HCOOH (pKa = 3.75) solution to reach a final pH of 5.1.