Calculate the concentration ammonia required to start precipitation of 0.12 M Mn(NO3)2. The Ksp for Mn(OH)2 is 4.6 x 10-14. The Kb for ammonia is 1.8 x 10-5. Enter your answer in scientific notation with only 2 significant figures. HINT: The concentration ammonia is the sum of the actual concentration ammonia + the ammonium concentration at equilibrium.
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