4 Abrahim Muna - Determine the percent composition of Limestone PDF

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Determine the percent composition of Limestone ...

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Muna Abrahim Chem111-001-06 Coconut Suhail Heather Cooper 9/30/19

Determine the percent composition of Limestone Introduction Purpose: The purpose of this lab is to quantify calcium carbonate in Limestone sample. Several different methods were used in this lab which are pH indicator and gravimetric analysis. There are two different types of filtration one was by using the filter by filter paper, and the other is using the vacuum filter. Students must know how to set both of the filtrations setting the filter paper and vacuum also the lab manual shows both types and visually.

Background information Limestone is essential in our societies only about 10% of Limestone is exposed on the earth's surface, but here in Kentucky, more than 50% of the surface of the rock is composed of the Limestone (French, 76). The Limestone is very beneficial; therefore, it is essential to understand. Filtration is the process in which the liquid particles are removed. The gravimetric analysis is used to determine the present of a elements (French, 78). Gravimetric is a technique used to determine the mass or concentration in substance by measuring the change in mass. Anion and cation analysis was also used. pH indicator, methyl in this lab is used to measure the level of pH level of solution. The methyl is remind red until the solution reach the the pH level of 4.4 then it will turn pink (French, 80). Before the lab activity is essential to understand the chemical reaction and substance addition to Limestone. When adding the Limestone to the acid, it fizzes because of the chemical reaction that produces carbon dioxide. The equations are shown below

CaCO 3 (s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l) (French, 77) Note: 2Moles of HCl→ 1mole of CO2 Calcium carbonate (CaCO 3 Hydrogen chloride (2HCl).

) react with

CaCl2(aq) + (NH4)2SO4(aq) → CaSO4(s) + 2NH4Cl(aq) (French,77) Note: 1 moles of CaCl2→CaSO4 This reaction shows that the precipitate, the solid substance result as product reaction

Muna Abrahim Chem111-001-06 Coconut Suhail Heather Cooper 9/30/19 which form CaSO4. This filter by the vacuum. Both equations above show the reliable substance result as a product of the chemical reaction is CaSO4, and this will be filtered using vacuum filtration. In this lab, Methyl red is a pH indicator; pH is used to measure the level of solid of Limestone and acid. It is essential to know that the methyl will remain red, and eventually, the solution will it turn pale yellow. Lastly, it is crucial to know the mass percent composition formula in order to calculate the chemical composition. The equation is shown below.

The equation: Mass % of A=(Mass of A /Totalmass of substance)x 100 (French,78). The equation above is used to calculate the chemical composition. Procedure/Methods

The procedure used in this lab were found in lab manual experiment 4: Quantifying competition (French, 75-81). There was a change made to procedure, we changed the amount of time the product was held in the oven. The procedure were used exactly as given in the lab manual.

Muna Abrahim Chem111-001-06 Coconut Suhail Heather Cooper 9/30/19 Works cited French, A, Allison Soult, Stephen Testa, Pauline Straman, M. Meral Savas, Francois Botha, Carolyn Brock, Charles Griffith, Darla Hood, Robert kiser, Penny O’connor, William Plucknett, Donald Sands, Dianne Vance, William Wagner. “Experiment 4: Quantifying the composition of Limestone.” General Chemistry111 lab Manual Plymouth: Macmillan Learning curriculum Solutions, 2019, Web.03 September 2019. Pg 75-81. https://www3.chem21labs.com/labfiles/36194_42_Exp%201%20FrenchA %201764-5%20F19..pdf...