18. Aqueous Equilibrium
Selective Precipitation
Multiple Choice
Multiple ChoiceSolution contains [Cu2+] = 0.035 M, [Sr2+] = 0.054 M, [Al3+] = 0.23 M. Cu2+ can be separated by selective precipitation using NaOH. What is the minimum concentration of NaOH needed to start precipitation of Cu2+? (Ksp = 2.2 × 10−20 of Cu(OH)2).
A
1.57× 10−19 M
B
7.93 × 10−10 M
C
3.96 × 10−10 M
D
1.19 × 10−9 M
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