Problem: A 1.0-L buffer solution contains 0.100 mol HC2H3O2 and 0.100 mol NaC2H3O2. The value of Ka for HC2H3O2 is 1.8 x 10–5. Calculate the pH of the solution upon addition of 50.1 mL of 1.00 MHCl to the original buffer.

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A 1.0-L buffer solution contains 0.100 mol HC2H3O2 and 0.100 mol NaC2H3O2. The value of Ka for HC2H3O2 is 1.8 x 10–5. Calculate the pH of the solution upon addition of 50.1 mL of 1.00 MHCl to the original buffer.