In this experiment, you will titrate a sample of pure potassium hydrogen phthalate (Table 10-4) with standard NaOH. A Gran plot will be used to find the equivalence point and Ka. Activity coefficients are used in the calculations of this experiment.

The titration curve for an acid-base titration is typically a plot of pH versus volume of added titrant. These curves are useful in selecting appropriate acid-base indicators that will permit accurate determinations of titration end points.

To gain experience performing acid-base titrations with a pH meter. To plot titration curves of pH vs. mL of titrant added. To determine the equivalence point of a titration from a titration curve.

Q1: a) Plot the titration curve of phthalic acid based on your data. Identify the equivalent point and estimated pKa(s) on the curve. b) Show all calculations for pKa of phthalic acid based on your data. c) Compare the pKa of benzoic acid with the pKa(s) of phthalic acid. Explain the difference.

You will be asked to compare the endpoints predicted by the indicators to the equivalence points determined from the titration curves. You will also compare the predicted pH for various amounts of titrant added in each titration to the experimentally determined pH's.

Simple pH curves. All the following titration curves are based on both acid and alkali having a concentration of 1 mol dm-3. In each case, you start with 25 cm 3 of one of the solutions in the flask, and the other one in a burette.

The titration of a weak acid or base is also useful for determining the Ka or Kb for an acid or base, respectively. In this experiment you will use a pH meter and buret to generate plots of titrations, called titration curves.

Identify the equivalent point and estimated pKa (s) on the curve. b)Showall calculations for pKa of phthalic acid based on your data. Here’s the best way to solve it. a). Titration curve has already been plotted which show that's it is a acid (phthalic acid) - base (NaOH) titration where equi … Not the question you’re looking for?

Consider a titration of solution of phthalic acid using NaOH, in which it takes 10 mL of the NaOH to reach the equivalence point. Sketch the shape of the titration curve, paying particular attention to the volume of the 1st and 2nd equivalence points.

The titration curve for an acid-base titration is typically a plot of pH versus volume of added titrant. These curves are useful in selecting appropriate acid-base indicators that will permit accurate determinations of titration end points.