I make a buffer solution from of 5.0 mL of 0.500 M sodium acetate (NaCH3COO) and 45.0 mL of 0.500 M acetic acid (CHCOOH).   I take 20 mL of this new buffer solution and I add 10 mL of a 0.1 M solution of HCl how can I calculate the new pH?

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.