A buffer is made by mixing 40.00 mL of a 0.100 M solution of the fictitious acid HA (pKa = 6.44) with 20.00 mL of 0.100 M NaOH.  This buffer is then divided into 4 equal 15.00 mL parts. If 0.15 mL of a 1.0 M solution of sodium hydroxide is added to one of these 15.00 mL portions of the buffer, what is the pH of the resulting solution?

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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.