Correct the product obtained was found to be fairly

Info icon This preview shows pages 3–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Correct: The product obtained was found to be fairly pure as it had a mp of 110-112° C, a mp range of only 2° C. This result was 3 degrees below the literature value of 115 °C for 'compound X'. Because the observed mp was depressed in comparison to the literature mp, this demonstrates that the product may not have been completely pure. Correct: The infrared spectrum of the alkene product (refer to page xx of your report) had the absorption bands of the expected alkene, 3050 cm -1 sp2 C-H stretch and 1650 cm -1 C=C sharp absorption. No broad alcohol band was observed at 3300 cm -1 , indicating no reagent alcohol remained and that the reaction resulted in the conversion of the alcohol to the alkene product. Incorrect: The product obtained was found to be pure. Data interpretation should demonstrate a clear understanding of the technique, the experiment, and the spectra.
Image of page 3

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

View Full Document Right Arrow Icon
Then, discuss any sources of error. Try to think of at least two sources. Sources of error include theoretical sources such as the reaction did not go to 100% completion, or practical sources such as the instrument or glassware used was not calibrated. Use this procedure for discussing error... First state the error: “The sample bottle indicated a 90/10 mixture by mass of urea to cinnamic acid. It is difficult to estimate that the actual portion of sample that was taken from this bottle for the experiment was the same as that listed on the bottle. It is not known how well the sample was mixed prior to the lab. If not mixed well, a different ratio could be represented in the small portion taken from the bottle.” This clearly says what the possible error is. Then, state exactly how it could affect the results: “If the sample bottle was not correct, then the data plotted for melting point depression of each sample would be construed.” If you can directly show proof that the error you postulated is consistent with your experimental observations, do so. Now, state how the problem could be addressed: “In order to prevent any possibility that the sample bottle differed from the actual sample taken, each pure chemical could be obtained and mixed in the exact mass ratio needed for the sample. Since the melting point sample is so small, this is not a likely answer. A possible solution would be to prepare a smaller sample and vigorously mix the bottle prior to taking a melting point.” Finally, mention at least one way to improve the experiment. C. Witness: Give your signature and a pledge that all of the observations and conclusions herein are your own and that you believe them to be correct. Then have another person witness your pledge with their signature. D. References: You should reference any literature used in your report, i.e. melting points, spectral data, etc. Use an acceptable scientific journal style/format for your references. Be consistent.
Image of page 4
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