PS8_Key - Chemistry 2080 Spring 2009 Problem Set#8 due date...

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Chemistry 2080 Spring 2009 Problem Set #8 - due date: Friday, April 3rd at 2 pm Name:_____ _KEY_______ Lab TA Name:__________________ Lab Day/Time:______________________ Practice problems (not graded). Chapter 17 : 32, 46, 71, 74, 1) This will require a bit of “library” research, and some calculations. For each of the titrations listed below, give a suitable indicator that would allow a reasonably accurate determination of the equivalence point for the titration. Also, for titrations (b) and (c) only, calculate the pH of the solution at the equivalence point . All solutions are in water, and are at 25°C. (Figure 17.8 in Petrucci et al shows a chart of indicators. Also, Table 16.3 gives values of K a ). (a) Titration of 100 mL of 0.10 M NaOH with 0.10 M HCl. This is a strong base/strong acid titration, so the equivalence point will be around pH 7. Therefore a suitable indicator would be bromothymol blue, with its pKa of 7.1 (b) Titration of 100 mL of 0.10 M ethylamine with 0.10 M HCl. This is a weak base/strong acid titration. The pH at the equivalence point can be calculated in the usual (ICE) way. Note that at the equivalence point the volume will be 200 mL.
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