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Alexis J. Lee_ Prelab 7 03_02_2022.pdf - Lee 1 Alexis J....

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Lee 1Alexis J. LeeProfessor MouatChemistry 1211 Lab02 March 2022Prelab 71)The limiting reactant is determined in this experiment.a.What are the reactants (and their molar masses) in the experiment?The firstreactant is K2C2O4x H2O (aq); its molar mass is 184.23 g/mol. The secondreactant is CaCl2x 2 H2O (aq); its molar mass is 147.01 g/mol.b.How is the limiting reactant determined in the experiment?As the experimentstates, the limiting reactant is determined from two precipitation tests of thefinal reaction mixture from Part A. Prepare the salt mixture, digest theprecipitate, set up a gravity filtering apparatus, withdraw and save supernatant,filter the CaC2O4x H2O precipitate, dry and measure the amount of CaC2O4xH2O precipitate, and formula the precipitate. You then have to clarify thesupernatant, test for excess C2O42-and Ca2.2)Experimental Procedure, Part A.2. What is the procedure and purpose of “digesting theprecipitate”?The procedure includes warm water dissolving smaller precipitateparticles, then the particles are re-precipitated onto other larger particles. The purpose
Lee 2of “digesting the precipitate” is to reduce the amount of precipitate passing through thefilter.4)
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Spring
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NoProfessor
Tags
Chemistry, Mass, Sodium

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