Experiment 4 - Grade: A PDF

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Lab 4...

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Brady Rolfes CHE 111-024 Kyle Baustert Paul Muehlbauer 18 February 2020 Limestone Composition Assessment Introduction: Calcium carbonate is found in some samples of limestone. Limestone is a very common rock that is found on the earth’s surface, but limestone can also be formed by the precipitation of a substance known as calcite, or calcium carbonate. For this lab, one will find the percent composition of calcium carbonate in different samples of limestone by using gravimetric analysis through two filtration process. Percent composition Formula: A% mass= (A’s mass)/ (Mass of substance) X100 The two different filtration processes are gravity filtration and vacuum filtration. These will help divide the precipitates and the solids from the aqueous solution. These two following equations will be helpful in the experiment: 1. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l) 2. CaCl2(aq) + (NH4)2SO4(aq) → CaSO4(s) + 2NH4Cl(aq) The first equation will be used for creating carbon dioxide, a gas, that with carbon dioxide’s mass, one will be able to use dimensional analysis to find the mass of the calcium carbonate. The first equation will also produce an anion. The second equation will produce a solid, and with the solid’s mass, one will be able to find the mass of calcium carbonate. The second equation will

also produce a cation. Finally, a pH strip will be used in order to know when exactly the solution goes from an acid to a base. Methods: No changes to the published procedure provided in the lab manual on pages 80-82 (French et, al 80-82).

Work Cited French, A., Allison Soult, Stephen Testa, Pauline Stratman, M. Savas, Francois, Botha, Carolyn Brock, Charles Griffith, Darla Hood, Robert Kiser, Penny O’Connor, William Plucknett, Donald Sands, Diane Vance, William Wagner. “Experiment 4: Quantifying the Composition of Limestone.” CHE 111 General Chemistry Laboratory Manual. Plymouth: Macmillan Learning Curriculum Solutions, 2019. 75-82. Web. 18 February 2020.

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