A buffer system is created by neutralizing the supernatant solution containing Pb^2+, Fe^3+, Al^3+, Ca^2+, Cu^2+, and K^+ ions with 6M NH3 solution and then adding an equal volume of 6M NH3 solution. Explain what forms of 6M NH3 were present in the final solution, their concentrations, and how they could function as a buffer. Please help. I do not understand this questional at all.
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I don't understand it either. You appear to have typed part of a line twice. If that extra 6M NH3 (equal volume added) is part of the question, the solution forms Pb(OH)4^2- from Pb(OH)2, Cu(OH)4^2- (from Cu(OH)2), and those could act as buffers.
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