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17. (6 pts) In an aqueous solution of NH3 at 25°C, the equilibrium concentration of H* is 4.3×10-¹2 M. Calculate the initial concentration of NH3 used in preparing this solution. a) 3.3×10-¹4 M b) 0.30 M c) 0.87 M d) 130 M e) 2.6 M