Lab report 5 Bhakti Patel PDF

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Stoichiometry of a Precipitation Reaction CHEM 1014 Bhakti Patel

Introduction The purpose of this experiment is to familiarize us with precipitation reactions and how to use stoichiometry to calculate the theoretical yield of reactants. The other objective is to teach us how to calculate the percentage yielding of a product that is produced. Knowledge of conducting and experiment where two reactants form a precipitate and how you have to properly identify their part of that chemical reaction. It also helps us to identify accurate measurements and how to calculate. We need to be familiar with laboratory equipment. Materials and Methods For this experiment we will be using distilled water, dish soap, paper towel, funnel, scale, 100 ml beaker, graduated cylinder, and other materials. We can find these all under the procedure that is lined by the hands-on lab(2015). It is important to wear safety goggles and gloves when dealing with chemicals. For this exercise, I measured my distilled water that was 25ml and poured it into each glass. Weighted the plastic boat on the digital scale which consisted of 2.0 g CaCl2 2H2O. Then this solution was added to one of the beakers with water and calculated it in moles. The data was recorded for this exercise in the table. The same steps were repeated but this time with Na2CO3. The solution was placed in a filter paper. Lastly, the mass of the precipitates was calculated Results

I allowed the substance to precipitate for some time and it seemed like the chemicals lost some of its initial weight. Besides, stoichiometry can be used o determine the product formed in the reaction, and we can also know how reactant is required for each reactant that can be used at the same time. For stoichiometry, we must always consider that “ make sure your equation is balanced! If the equation is not balanced, the mole ratios will be wrong, and the answers will not be correct.” Lastly, their quantities can also be used to maximize the number of products that are formed from the chemical reaction.

Citation Chang, R., & Goldsby, K. A. (2016). Chemistry: Raymond Chang and Kenneth A. Goldsby. New York: McGraw-Hill Education. Hands-On Labs. (2015). HOL Courseware and Resources. Denver, CO.

“Stoichiometry: Stoichiometric Ratio Examples (Article).” Khan Academy, Khan Academy, www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/stoichiometry-

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