NH3 + H2O ==> NH4^+ + OH^-
You know Kb and initial NH3 (6.0M), set up Kb expression and solve for OH^-.
Then Qsp = (Mn^2+)(OH^-)^2
Plug in values for Mn^2+ and OH^- and compare Qsp with Ksp. Post your work if you need further assistance and explain exactly what you don't understand.
If a 0.01M Mn(NO3)2 solution has an ammonia concentration of 6.0M, would a precipitate form? Calculate the ion product and compare to Ksp.
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