Laboratory Weighing Experiment Report Template for Chemistry 348

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Rutgers University *

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348

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Chemistry

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Feb 20, 2024

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Uploaded by MinisterStarGoldfinch36

Number your pages -1- Fall 2023 Chemistry 348 Instrumental Analysis, 7 September, 2023 Fall 2023 Chemistry 348 Laboratory Weighing Experiment Report Template See course textbook " Principles of Instrumental Analysis" | 7th Edition, Appendix One, Pages 887-905. Use this template so that all laboratory reports can be graded the same, and it provides you with the required data, and you can see how points (dollars) will be deducted from your laboratory report. Total Amount $100. Laboratory reports are based on dollar amounts. . Title: 2023 Chemistry 348 Weighing and Pipetting Experiment ( $2 ) First Name Family Name, ( $2 ) Department of Chemistry and Chemical Biology (use your department major), Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08901. Experiment Performed: September x, 2023, Due Date September x, 2023 ( $2. ) Abstract: Briefly explain what you did and what you found. ( $5. ) 100-200 words are ok. Keywords: weighing, coin analysis, pipetting, statistics ( $5. ) ______________________________________________________________ Start new page. Number all pages at the bottom of the report ( $2. ) I. Introduction ( $ 10. ) Briefly explain background information for the experiment. Include basic statistical equations, means, and standard deviations, or make a reference to the equations you used. Number all equations sequentially if used. Include basic information on the composition of the coins you measured and provide references if available. Number references consecutively with superscripts . For example, Copper scents were first used in the United States in 1865 1 . (Superscript 1 is the reference.) Do not use footnotes .

Number your pages -2- II. Experimental ( $10. ) Equipment ( $5 .): Electronic balances (see laboratory for the specific name of balance, please record, provide the manufacturer, city, state), thermometer, 100 mL beaker, 5-mL pipet ( provide the manufacturer, city, state ), x-mL Nalgene polyethylene bottle with cap, and weighing boat or weighing paper. Procedure: ( $5 .): Briefly explain what you did. III. Results ( $47. ) Table I. summarizes the data collected for water weighing using the yy pipet. Table I. Summary of Pipetting Water ( notice units on the columns ). ( $2. ) Note that table headings go on top of the table. Measurement # Mass of bottle + water (g) Mass of Water (g) Water Volume (mL) 1 5.00 2 5.00 3 5.00 4 5.00 5 5.00 Continue data with other volumes. If there is a page break interrupting the table, continue the table with the correct headings on the new page. Also, write Table I. Continuation. I calculated the mean and standard deviation at the 95% confidence interval. ( See textbook Pages 887-905 for information on determining the 95% confidence interval. ) Table II. Summarizes the descriptive statistics of the water weightings using the yy pipet.

Number your pages -3- Table II. Summary of Descriptive Statistics of Pipetting Water ( $8. ) Note that table headings go on top of the table. Water Volume (mL) Mean Mass of Water (g) Standard Deviation (g) %RSD 5.00 x.abcd 0.efgh I.jk 10.00 15.00 20.00 25.00 Note to the student: be sure that there are no more than 4 places after the decimal point for the mean 5. 0001 g and standard deviation, 0. 0002 g. Why? Result section points $10. ,

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Number your pages -4- Figure 1. shows the correlation between the mass (g) of the water and its volume (mL) measured at room temperature (zz C o ). Volume (mL) Figure 1. Graph of mass (g) water vs. its volume (mL). ( $10. ) Note to the student: notice all axes are labeled, and the figure caption goes below the figure, i.e., bottom and not on top of the figure. From Figure 1, the equation of the line with slope tells me the blank (answer) $5. of water. This value is consistent with the reported value for water at the water temperature measured during my weighing laboratory experiment. My weighing results for the different coins are summarized in Table 3. Mass (g) Add equation of line trend line) with R ( 2 . Error bar = standard deviation of mass of water.

Number your pages -5- Table 3. Identification and masses of different US coins. ( $2. ) Note that table headings go on top of the table and not below. There are five coins per cent. Cent Mint Year ID with mintmark if any. One Coin (g) Mass 1 (g) Mass 2 (g) 1X ₵ 2X ₵ 3X ₵ 4X ₵ 5X ₵ Repeat for other cents Note: One coin is the coin weighed with a weighing boat tared to 0.0000 g. To the students, use the correct number of significant figures and the number of decimal places to the right of the masses. For example, a typical US penny would be recorded as 3.0101 g and not 3.010, 3.0, 3.01011, or 3.00 g. All coins have a mint year and some may have the mint mark (D, SF, P) where the coin was minted.

Number your pages -6- Table 4. Compare mass one coin (tared boat 0.0000 g) vs same coin weighed two times with weighing boat not tared to 0.0000 g. ($6) Same Coin Mint Year ID with mint mark if any. One Coin (g) Mass 1 (g) Mass 2 (g) Mean ± g Difference (g) penny nickel dime quarter Note: Difference is one coin tared boat minus the mean of the same coin weighed two times with boat not tared to 0.0000 g. Comment on the results and which weighing method you trust. I calculated the mean and standard deviation at the 95% confidence interval. ( See textbook Pages 887-905 for information on determining the 95% confidence interval. ) Various spreadsheets calculate these as well as a good calculator. See also OriginLab software. From Table 3. above, Table 5. summarizes the descriptive statistics of my US coins. The mean is the mean of the two weighings Method 1, weighing by difference. Table 5. Descriptive statistics of US Coins. ( $8. ) Note that table headings go on top of the table and not below. Cent Mean Mass (g) Standard Deviation (g) % RSD X ₵ x.abcd 0.efgh I.jk Y ₵ Z ₵ W ₵ Note to the student : be sure that there are no more than 4 places after the decimal point for the mean and standard deviation. Why? Shown in Figure 2. is a bar graph summarizing my data for the US coins. (Professor Hall's example shows three, but you should have four coins.)

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Number your pages -7- Are error bars, i.e. standard deviations. Figure 2. Different masses of US coins. ( $6. ) Figure caption below the figure. The chemical compositions of the different US coins are summarized in Table 5. Table 5. Chemical composition of US coins. ( $4. ) Note that table headings go on top of the table and not below. US Coin Element (%) Element (%) Element (%) Element (%) etc. Penny Nickel Dime Quarter IV. Conclusions ( $8. ) Write a brief description summarizing your results and what you found. Include information on the coins' chemical compositions and how the chemical compositions have changed over time. Discuss your precision in pipetting and mention something about the accuracy of the pipet in delivering 5.00 mL of water. This implies that you performed a calibration of the pipet for delivering 5.00 mL of water. What kind of accuracy would you expect if you dialed in 2.00 mL? V. References ( $3. ) in numerical order and numbered consecutively in the report as superscript (Jones 1 ). Trace elements in the coins Jones 1 . You 0 1 2 3 4 5 6 7 1 2 3 Coin Mass Mass z - cent X - cent Y - cent Z - cent

Number your pages -8- could also report, Jones 1 measured the trace elements in US coins by EDXRF. No internet references. Example of refereed journal article citing with authors, title, and journal reference and a book reference. Must be in the format below. V. References: 1. Jones MD and Cabo N ( authors) , Trace element analysis of US Cents. ( full title of the article ). J Agric Food Chem ( journal title ) 47:709–719 (1999) ( volume, pages, and year ). 2. Environmental Analytical Chemistry, eds. F. W. Fifield and P. J. Haines, Blackwell Science, 2000, 2nd edn. (A book reference format). Submit your laboratory report to Canvas, upload, under your section heading. Use the file name: 2023 Chem 348 First Last name weighing experiment.pdf. Only pdf files will be accepted, and all others rejected. If late, -$10. Reports submitted more than one week after the due date will not be graded and you will receive 0 dollars for this laboratory experiment. Do not e-mail your report to your TA or to Professor Hall. This is just a simple report format, and you can write your own or just fill in the information requested. See the student checklist below. Chemistry 348 Staff

Number your pages -9- Student Checklist before submitting your weighing laboratory report to minimize grading deductions. In previous years, these have been some common omissions in student laboratory weighing reports. Include it with your report. 1. All tables are labeled with a caption at the top. ______________ Initial 2. All columns in the table have labels. _________________ Initial 3. All graphs have captions at the bottom of the graph. __________ Initial 4. All graphs have labeled axis. __________________ Initial 5. All masses weighed on the balances have four decimal places after the decimal. ______________ Initial 6. All coins have an ID. _____________ Initial 7. All references are reported correctly. ___________ Initial 8. I have a trend line for my mass vs. volume plot for water. _________ Initial 9. I have an equation of line for my mass vs. volume plot for water. ________ Initial 10. I have error bars on my mass vs. volume plot for water. ___________ Initial 11. I have error bars on my coin mass plot. ___________ Initial 12. I have an abstract. ____________________ Initial 13. I have keywords. ___________________ Initial 14. My title, abstract, and keywords are only on page one. ________ Initial 15. I have the correct title of my report. _____________ Initial 16. I have page numbers on my report. ______________ Initial 17. I uploaded my report to Canvas in pdf file format. ____________ Initial

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Number your pages -10- Upload your weighing laboratory report here in pdf file format only. Use the filename 2023 Chem 348 Weighing Lab First Last name.pdf We cannot accept any files other than .pdf and all reports have to be submitted to Canvas. We cannot accept any files sent by e-mail to the teaching assistant and to Professor Hall. Thanks, Staff Chemistry 348