A Student Does a Titration of NH₃(aq)(pK_b = 4

Short Answer

A student does a titration of NH₃(aq)(pK_b = 4.76)with HCl(aq). When 100.0 mL of the HCl solution had been added to 500.0 mL of 0.300 M NH₃(aq), she measured the pH of the mixture and found it was 9.54. What was the molarity of the HCl solution?Hint: Treat this solution like a buffer and remember that adding HCl simultaneously increases NH₄^{+ and decreases NH}₃.