# Stoichiometry Of A Precipitation Reaction Lab Report

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1) Jeffrey Cox CHE111-DL01 Lab number 10 Stoichiometry of a Precipitation Reaction 2) Purpose/ Intro. In this lab we will be able to calculate the actual, theoretical, and percent yield of the product from a precipitation reaction. We will thusly learn the concepts of solubility and the formation of a precipitate. A precipitate reaction is a reaction in which soluble ions in separate solutions are mixed together to form an insoluble compound that settles out of the combined solution as a solid. The solid then is the insoluble compound, called a precipitate. Our objectives are to predict the amount of product produced in a precipitation reaction using stoichiometry. Also, we are to accurately measure the reactants and products of the…show more content…
We used 1g of Na2CO3 -Sodium Carbonate. This would allow for the full precipitate to form. 4) Procedure: Refer to CHE 111 lab manual, experiment Stoichiometry of a Precipitation Reaction on page #104 5) Data / results. We used 1g of Na2CO3 -Sodium Carbonate in combination with 1g CaCl2·2 H2O-Calcium Chloride, Dihydrate to form the precipitate reaction. Na2CO3 aq + CaCl2*2H2O aq = CaCO3 s + 2 NaCl aq + 2 H2O aq Molar Mass: Ca = 40.08 Cl2 = (35.45) x 2 = 70.9 2H2O = (18.02) x 2 = 36.04 40.08 + 70.90 + 36.04 = 147.02 g/mol CaCl2*2H2O Theoretical yield: 1g CaCl•2H2O x 1 mol CaCl•2H2O x 1 mol CaCO3 x 100.09g CaCO3 = 0.68 g CaCO3 147.02g CaCl•2H2O 1 mol CaCl•2H2O 1 mol CaCO3 Mass of weighing dish = 0.6g Mass of filter paper =…show more content…
And according to our data, our actual yield is 0.5g CaCO3. Thus, our percent yield is 73.5%. Our percent yield was close to 100%, but not very close. I believe the error lies in human error, as well as instrumentation sensitivity. Our scale only measures to grams accurately, and could have not accurately represented the .68g of CaCO3, or we could have lost the solid precipitate in the process of the experiment. These errors could be reduced with a more accurate scale, as well as more experienced hands performing the procedure, or skilled hands, ie: we are novices at this lab, and training could produce more accurate