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

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A student does a titration of NH3(aq)(pKb = 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), he measured the pH of the mixture and found it was 8.94. 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 NH3.

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