Using 1.0 × 10-6 M as the criterion for quantitative removal, determine whether it is feasible to use
(a) SO42- to separate Ba2+ and Sr2+ in a solution that is initially 0.040 M in Sr2+ and 0.20 M in Ba2+.
(b) SO42- to separate Ba2+ and Ag+ in a solution that is initially 0.030 M in each cation. For Ag2SO4, Ksp = 1.6 × 10-5.
(c) OH- to separate Be2+ and Hf4+ in a solution that is initially 0.030 M in Be21 and 0.020 M in Hf4+. For Be(OH)2, Ksp = 7.0 × 10-22, and for Hf(OH)4, Ksp = 4.0 × 10-26.
(d) IO3- to separate In3+ and Tl+ in a solution that is initially 0.30 M in In31 and 0.10 M in Tl+. For In(IO3)3, Ksp = 3.3 × 10-11, and for TlIO3, Ksp = 3.1 × 10-6.
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