PS8_Key

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

This preview shows pages 1–2. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern