Lab Report 1 - the most product may have been lost. This...

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John Xu 2/16/07 Chem 211 Lab Report Experiment 1: Synthesis of Potassium Ferric Oxalate Trihydrate Calculations: Theoretical Yield of K 3 Fe(C 2 O 4 ) 3 • 3H 2 O 5.10 g Fe(NH 4 ) 2 (SO 4 ) 2 • 6H 2 O/383 g•mol -1 Fe(NH 4 ) 2 (SO 4 ) 2 • 6H 2 O = 0.0133 mole Fe(NH 4 ) 2 (SO 4 ) 2 • 6H 2 O 1 mole Fe(NH 4 ) 2 (SO 4 ) 2 • 6H 2 O is required for 1 mole K 3 Fe(C 2 O 4 ) 3 • 3H 2 O 0.0133 mole K 3 Fe(C 2 O 4 ) 3 • 3H 2 O * 490 g•mol -1 K 3 Fe(C 2 O 4 ) 3 • 3H 2 O = 6.52 g K 3 Fe(C 2 O 4 ) 3 • 3H 2 O Percent Yield of K 3 Fe(C 2 O 4 ) 3 • 3H 2 O Actual Yield of K 3 Fe(C 2 O 4 ) 3 • 3H 2 O: 5.70 g 5.70 g K 3 Fe(C 2 O 4 ) 3 • 3H 2 O/ 6.52 g K 3 Fe(C 2 O 4 ) 3 • 3H 2 O * 100% = 87.4% yield Post Lab Questions: 1. The percent yield was less than 100% because of the loss of some reactants during the process of decanting the solutions. Some of the solution was left behind when attempting to prevent the transfer of the precipitate. Also, it is possible that some of the solution was lost in the form of gas when it was heated without the use of a lid. 2. By calculating the percent yield for each step, it is possible to know at which step in the procedure
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Unformatted text preview: the most product may have been lost. This way, the source of error can be more easily identified. 3. a) 88.0 gmol-1 C 2 O 4 2-* 3 moles= 264 g C 2 O 4 2-in K 3 Fe(C 2 O 4 ) 3 3H 2 O 264 g C 2 O 4 2-/ 490 g K 3 Fe(C 2 O 4 ) 3 3H 2 O = 53.9 % C 2 O 4 2-b) 4.37 g K 3 Fe(C 2 O 4 ) 3 3H 2 O/490 gmol-1 K 3 Fe(C 2 O 4 ) 3 3H 2 O = 0.00891 moles K 3 Fe(C 2 O 4 ) 3 3H 2 O 3 moles C 2 O 4 2-per mole K 3 Fe(C 2 O 4 ) 3 3H 2 O 3 * 0.00891 moles C 2 O 4 2-= 0.0267 moles C 2 O 4 2-0.0267 moles C 2 O 4 2- * 88.0 gmol-1 C 2 O 4 2- = 2.35 g C 2 O 4 2- 2.35 g C 2 O 4 2- / 4.37 g K 3 Fe(C 2 O 4 ) 3 3H 2 O = 53.8% C 2 O 4 2- This is close to the first value. 4. K 2 C 2 O 4 would most likely also be in the solution because there is an excess of it in the reactants due to the limiting reactant....
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This note was uploaded on 04/07/2008 for the course CHEM 211 taught by Professor Crane, b during the Spring '06 term at Cornell University (Engineering School).

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