Calculate the ph of the solution that results nh3

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Question- Calculate the pH of the solution that results when 40.0 mL of 0.12 M NH3 is a) Diluted to 20.0 mL with distilled water. b) Mixed with 20.0 mL of 0.25 M HCl c) Mixed with 20.0 mL of 0.30 M HCl solution d) Mixed with 20.0 mL of 0.20 M NH4Cl

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