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A 1.936 L buffer solution is 0.581 M in acetic acid and 0.581 M in sodium...

A 1.936 L buffer solution is 0.581 M in acetic acid and 0.581 M in sodium acetate. Acetic acid has a pKa of 4.74, making the pH of this solution 4.74. What is the pH after addition of 0.083 mol of HCl?

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