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Lab 3a

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Introduction: The purpose of this lab was to learn the proper techniques of roasting, smelting, and volumetric analysis to determine an unknown sample of copper mineral.
Results: For part one of Lab 3a, Day one, the beginning unknown mineral was a blue-green color. The mineral was charcoal colored after the roasting process. Roasting caused the mineral to lose mass. The lost mass was due to release of gas.
Roasting
Start Mass End Mass Percent Cu
0.390g 0.284g 58.2%
Table 1. Mass of CuO mineral before and after Roasting
Roasting is the most precise method, of the three conducted in the lab. The data found by each lab group was averaged with three other groups to find the unknown mineral.
Percent Cu in each group
58.2% 58.8% 56.6% 57.0%
Average …show more content…

Percent error (www.gmasononline.com)
References:
"Lab 3a: Production of Copper and Identification of a Copper Mineral (Roasting & Smelting)." Chemistry Sharepoint. USAFA, n.d. PDF. 28 Aug. 2015.
"Lab 3b: Identification of a Copper Mineral (Spectroscopy & Smelting)." Chemistry Sharepoint. USAFA, n.d. PDF. 01 Sept. 2015.
"Lab Report Guidance." (n.d.): n. pag. Chem 100. PDF. 12 Sept. 2015.
Lt Col Herbelin. "Chem 100." Department of Chemistry. USAFA, n.d. Web. 10 Sept. 2015.
Tro, Nivaldo J. Chemistry: A Molecular Approach. NJ: Pearson Education, 2014. Print.
Documentation: 28 August & 1 September 2015 C4C Lauren Truax was my lab partner and we worked together to discover the results of the unknown mineral and calculations.
1 September 2015 Captain Leppert’s T1/2 Lab 3 Group 1. I used data from their results to find a mean and standard deviation of roasting the copper mineral
13 September 2015 I looked up the percentage error formula to be sure that I did the calculation correctly.
13 September 2015 C4C Jacee French She sent me the email that had the grading rubric in it that we received in class. She also gave me guidance on whether or not I should write about the mineral my percent composition matched up with or the mineral near that with the correct physical

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