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Ignoring activities, determine the molar solubility of copper (I) azide (CuN3) in a solution with a pH of 13.11. Ksp (CuN3) = 4.9 × 10-9; Ka (HN3) = 2.2 × 10-5.

Use the systematic treatment of equilibrium to solve this problem.
Pertinent Reactions are:
CuN3(s) <==> Cu+ + N3-
N3- + H2O <==> HN3 + OH-
H2O <==> H+ + OH-

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