Analytical Chem istry - DePauw University

Chapter 9 Titrimetric Methods5135. Tartaric acid, H 2 C 4 H 4 O 6 , is a diprotic weak acid with a pK a1 of 3.0and a pK a2 of 4.4. Suppose you have a sample of impure tartaric acid(purity > 80%), and that you plan to determine its purity by titratingwith a solution of 0.1 M NaOH using an indicator to signal the endpoint. Describe how you will carry out the analysis, paying particularattention to how much sample to use, the desired pH range for theindicator, and how you will calculate the %w/w tartaric acid.6. The following data for the titration of a monoprotic weak acid with astrong base were collected using an automatic titrator. Prepare normal,first derivative, second derivative, and Gran plot titration curves for thisdata, and locate the equivalence point for each.Volume of NaOH (ml) pH Volume of NaOH (mL) pH0.25 3.0 49.95 7.80.86 3.2 49.97 8.01.63 3.4 49.98 8.22.72 3.6 49.99 8.44.29 3.8 50.00 8.76.54 4.0 50.01 9.19.67 4.2 50.02 9.413.79 4.4 50.04 9.618.83 4.6 50.06 9.824.47 4.8 50.10 10.030.15 5.0 50.16 10.235.33 5.2 50.25 10.439.62 5.4 50.40 10.642.91 5.6 50.63 10.845.28 5.8 51.01 11.046.91 6.0 51.61 11.248.01 6.2 52.58 11.448.72 6.4 54.15 11.649.19 6.6 56.73 11.849.48 6.8 61.11 12.049.67 7.0 68.83 12.249.79 7.2 83.54 12.449.78 7.4 116.14 12.649.92 7.6Some of the problems that follow require one ormore equilibrium constants or standard state potentials.For your convenience, here are hyperlinksto the appendices containing these constantsAppendix 10: Solubility ProductsAppendix 11: Acid Dissociation ConstantsAppendix 12: Metal-Ligand Formation ConstantsAppendix 13: Standard State Reduction Potentials7. Schwartz published the following simulated data for the titration of a1.02 × 10 –4 M solution of a monoprotic weak acid (pK a = 8.16) with