What must be the NH3 concentration in a 0.100 M AgNO3 solution to prevent precipitation of AgCl when enough NaCl has been added to raise its concentration to 0.500 M? Ksp for AgCl is 1.78 x 10^-10 and the Kf for formation of Ag(NH3)2+ is 1.6 x 10^7?
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