To a 25.00 mL volumetric flask, a lab technician adds a 0.450 g sample of a weak monoprotic acid, HA, and dilutes to the mark with distilled water. The technician then titrates this weak acid solution with 0.0829 M KOH. She reaches the endpoint after adding 47.75 mL of the KOH solution. Determine the number of moles of the weak acid in the solution. moles of weak acid: mol Determine the molar mass of the weak acid. molar mass = g/mol After the technician adds 15.65 mL of the KOH solution, the pH of the mixture is 5.61. Determine the pK, of the weak acid. pKa =

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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.