Experiment_7__Buffer_Lab_Report_rduong_duongExperiment7

Experiment_7__Buffer_Lab_Report_rduong_duongExperiment7 -...

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
EXPERIMENT 7: BUFFER LAB (INFORMAL) Pre-Lab Questions ( 5 points each ): __9___ / 10 pts Data: ___0___ / 10 pts Table containing pH data from Experiment 1. This table should include the theoretical pH values, the actual measured pH values, and the pH values after correctly preparing the buffer solutions. (5 points) Table containing all pH values for all 7 acetic acid/acetate solutions. (5 points) Sample Calculations: ____5__ / 5 pts Buffer Capacity Calculation (5 points) Results: ____8__ / 16 pts Plots of measured pH vs. Drops (HCl or NaOH) added for each of the 7 buffer solution. Plots must be properly labeled and constructed. Plots must also contain linear regression and the equation of the lines for each. Conclusion: __7____ / 7 pts Questions & Calculations: ___38___ / 48 pts Question 1: 2 pts Question 2: 2 pts
Image of page 1

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

View Full Document Right Arrow Icon
Question 3: 5 pts Question 4: 10 pts Question 5: 4 pts Question 6: 5 pts Question 7: 5 pts Question 8: 5 pts Question 9: 10 pts Style (organization, spelling, grammar, neatness, etc…) ___4___ / 4 pts Deductions (i.e., Late Lab Report, incorrect formatting, spelling etc.) - ______ Total Score ___71___ / 100 pts
Image of page 2
Experiment 7: Buffer Lab: Preparation and Investigation of Buffers Richard Duong Lab Partner: Devon West October 2, 2009 Christopher Backlund Chem 241L, Section 420, Chapman Hall 125 The work presented in this report is my own, and the data was obtained by my lab partner and me during the lab period.
Image of page 3

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

View Full Document Right Arrow Icon
Pre-Lab Questions 1a. How much pure acetic acid(mL) would be needed to prepare 100mL pH 5.00 buffer that is . 200M Acetic Acid (CH CO H)? (molar mass CH CO H=60.05g/mol and density of CH CO H=1.049 g/mL) .200M CH CO H x .100L = .0200mol CH CO H x 60.05g/mol x 1mL/1.049g = 1.14mL CH CO H 1b. Calculate mass(g) of sodium acetate needed to add to make 100mL pH 5.00 buffer solution. (molar mass of NA CH CO ·3H 0=136.08g) Using the formula pH = pKa + log(A¯/HA): Desired pH= 5.00, pKa=4.756; therefore 5.00 = 4.756 + log(A¯/HA) 10^(5.00-4.756) = 10^ log(A¯/HA) Solving for the ratio of (A¯/HA), we get the ratio to be 1.754 Using the calculated moles of CH CO H from part 1a: 1.754 = (A¯/.0200mol CH CO H) A¯=.0351mol of CH CO ¯ needed .0351mol CH CO ¯ x (1mol NA CH CO ·3H 0/1mol CH CO ¯) x (136.08g/1 mol NA CH CO ·3H 0) = 4.77g NA CH CO ·3H 0
Image of page 4
2. Prepare 100mL pH 5.00 solution adding 1.0M NaOH using same amount of CH CO H as in 1, how much NaOH(mL) is needed?
Image of page 5

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

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern