Exp4LabRpt- GenChem - Make sure you save this document before uploading to Canvas(Also re-open your saved document to confirm data is present before

Exp4LabRpt- GenChem - Make sure you save this document...

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Unformatted text preview: Make sure you save this document before uploading to Canvas (Also, re-open your saved document to confirm data is present before uploading to Canvas). Experiment 4: Calcium Carbonate Analysis Report Sheet 9/22/2020 Kendal Miletich Name____________________________ Date______________ Lab Section_____________ (e.g., Tues, 8am) Tues, 8:30 am Part A. Calibration Curve Trial 1 Mass CaCO3 (s) used (g) Initial syringe readings (mL) Rubber seal Solution Volume of Air Final syringe readings (mL) Rubber seal Solution Volume of Air + CO2 Volume of CO2 Trial 2 Trial 3 Trial 4 Trial 5 0.051 0.074 0.100 0.128 0.152 --------------------------- ----------------------- ----------------------- ----------------------- --------------------------- 19mL 5mL 14mL 14mL 5mL 9mL 13mL 5mL 8mL 17mL 5mL 12mL 18mL 5mL 13mL --------------------------- ----------------------- ----------------------- ----------------------- --------------------------- 27mL 4mL 23mL 9mL 26mL 5mL 21mL 12mL 32mL 3mL 29mL 21mL 42mL 3mL 39mL 27mL 49mL 5mL 44mL 31mL Part B. CaCO3 in an antacid tablet using calibration curve and volume of gas. Tums (Identity of antacid tablet (i.e., Tums, Rolaids, generic, etc.)): ______________ 0.320g Mass of ANTACID used: ________________ Initial syringe readings (mL): 17mL Rubber seal: _____________ 5mL Solution: _____________ 12mL Volume of air: _____________ Final syringe readings (mL): 43mL Rubber seal: ______________ 5mL Solution: _______________ 38mL 26mL Volume of air + CO2 : _____________ Volume of CO2: ____________ Part C. CaCO3 in antacid tablet using mass-lost method. 1.257g Mass of ANTACID used: ________________ (one tablet) 112.005g Mass of 125 mL Erlenmeyer + HCl (aq) + ANTACID before reaction: ______________ 111.811g Mass of 125 mL Erlenmeyer + HCl (aq) + ANTACID after reaction: _______________ 0.1940g Mass of CO2 lost: _________________ 43 Postlaboratory Analysis 1. Using Excel or another graphing program, plot the volume of CO2 vs. mass of CaCO3 using your data for the calibration curve in Part A as a scatter plot. Make sure your graph adheres to the guidelines outlined in Appendix A. Add a trendline and include the equation of the line on your graph. Upload this plot to Canvas as a separate file as part of your report submission. (Note: this is an independent assignment. Make sure you turn in your own work. Any evidence to the contrary is considered cheating.) 2. Using the equation generated from the graph in question one, calculate the mass of CaCO3 (s) in the sample of antacid tablet you analyzed in Part B. Show all work below. y = 230.95x - 3.3255 y is the volume of CO2 so it is 26mL 26 = 230.95x-3.3255 26+3.3255 = 230.95x 29.3255/230.85x = 230.85x/230.85 x = 0.12703 is the mass of the CaCO3 in the antacid tablet used. 3. Calculate the % mass of CaCO3 (s) in the Antacid tablet in Part B. Show all work below. 0.12703g CaCO2/0.320g Tums X 100 0.39 X100 = 39% The mass % of CaCO3 (s) in the Antacid tablet is 39% 44 4. Write the balanced chemical equation for the reaction of calcium carbonate with hydrochloric acid. CaCO3(s) + 2HCl(aq)---> CaCl2(aq) + CO2(g) + H2O(l) a. From the mass of CO2 lost in Part C calculate the number of moles of CO2 lost. Show dimensional analysis. Mass of CO2 lost is 0.1940g 0.1940gCO2(g) X 1 molCO2/44.01gCO2(g) = 0.0044molCO2(g) 0.0044molCO2(g) was lost in Part C b. Use your answer above, the balanced chemical equation, and the molar mass of CaCO3 to calculate the original mass of CaCO3 in the sample of antacid used in Part C (Show calculation with dimensional analysis.) in theory, 100.1g of CaCO2 should produce 44.01g CO2 1.257g in tablet - 0.1940 G CO2 (g) = 1.063g CaCO3 in one tablet c. Calculate the % mass of CaCO3 (s) in the antacid tablet. 1.063g CaCO3 (s)/ 1.257g in Tums X 100= 84.5% of Tums is CaCO3 5. Compare the % mass calculated using the two methods. Which method gave the more accurate result based on the amount of CaCO3 per tablet listed on the bottle? I believe that the calibration curve was more accurate than Mass lost method. On the Tums bottle, it says that .5g of the tablet is CaCO3, adn the tablet I measured was 1.257g, which makes it 38% CaCO3, and using the calibration curve, I got 39%, which is very close. Now for the Mass lost method, I do believe that there is somewhere that I went wrong and potentially messed up the experiment, becuase I got a large 84.5% for the mass of CaCO3 in one Tums tablet. 45 Make sure you save this document before uploading to Canvas (Also, re-open your saved document to confirm data is present before uploading to Canvas). ...
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