Calculate the pH at 25 ° C when 120 mL of a HCl solution having a concentration of 50 mM is added 50.0 mL of a 120 mM ephedrine solution. Assume no change in temperature.

Amitriptyline is a drug used in treating depression. It is typically formulated as the hydrochloride salt (structure see below). pKa of the corresponding acid to amitriptyline is 9.76 at 25 ° C.

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