ia 17.70 (a) Will Co(OH)2 precipitate from solution if the pH of a 0.020 M solution of Co(N03)2 is adjusted to 8.5? (b) Will AgIO3 precipitate when 20 mL of 0.010 M AgIO, is with 10 mL of 0.015 M NalO3? (Ksp of AgIO3 is 3.1 x 10 17.71 Calculate the minimum pH needed to precipitate Mn(OH)2 so completely that the concentration of Mn2+(ag) is le2 than 1 ug per liter [1 part per billion (ppb)]. 17.72 Suppose that a 10-mL sample of a solution is to be tested for I ion by addition of 1 drop (0.2 mL) of 0.10 M Pb(NO,. What is the minimum number of grams of I that must be ate he de ct present for Pbl2(s) to form? 17.73 A solution contains 2.0 x 10M Ag*(ag) and 1.5 x 10-3 MPb2*(aq). If Nal is added, will Agl = 8.3 x 10-17) or Pbl2 (Ksp = 7.9 x 10) precipitate (Ksp = first? Specify the concentration of I (ag) needed to begin precipitation. %3D 17.74 A solution of Na,SO, is added dropwise to a solution that is 0.010 M in Ba²+(ag) and 0.010 M in Sr2*(aq). (a) What concentration of SO- is necessary to begin precipitatione (Neglect volume changes. BaS04: Ksp Ksp = 1.1 x 10-10, SISO = 3.2 x 10.) (b) Which cation precipitates first? (c) What is the concentration of SO (ag) when the sec- %3D ond cation begins to precipitate? 17.75 A solution contains three anions with the following concentrations: 0.20 MCrO,0.10 MCO2, and uly added to