4b - POSTLAB ANSWER KEY 1. (2 points) 2 Fe 2+ + Cl 2 2 Fe...

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Dr. S. Berniolles, Page 1 of 1 CHEM 6BL PRELAB/POSTLAB ANSWER KEY EXPERIMENT #4B: ANALYSIS OF OXALATE LIGANDS IN AN IRON (III) OXALATE COMPLEX PRELAB QUESTIONS (10 points) and POSTLAB QUESTIONS (15 points) PRELAB ANSWER KEY 1. (2 points) 2 MnO 4 + 5 H 2 C 2 O 4 + 6 H + 2 Mn 2+ + 10 CO 2 + 8 H 2 O 2. (2 points) 0.09823 M KMnO 4 3. (2 points) 0.7062 mmol of C 2 O 4 2- 4. (2 points) 57.34 % C 2 O 4 2- 5. (1 point) KMnO 4 is not strong enough to oxidize Fe 3+ to Fe 6+ (No Fe 4+ /Fe 5+ in coordination complexes). 6. (1 point) If you titrate too quickly, you will overshoot the endpoint. Answer will be too large. 7. (0 points) See MSDS Information
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Unformatted text preview: POSTLAB ANSWER KEY 1. (2 points) 2 Fe 2+ + Cl 2 2 Fe 3+ + 2 Cl 2. The balanced equation from Prelab Question #1 is: 2 MnO 4 + 5 H 2 C 2 O 4 + 6 H + 2 Mn 2+ + 10 CO 2 + 8 H 2 O a) (2 points) 0.6128 mmol C 2 O 4 2-b) (2 points) 53.72 % C 2 O 4 2-c) (2 points) 0.2060 mmol of Fe 3+ , 11.37 % Fe 3+ d) (2 points) 0.6107 mmol K + e) (2 points) 0.6121 mmol H 2 O Fe 3+ : H 2 O = 1:3. f) (2 points) K 3 [Fe III (C 2 O 4 ) 3 ]3H 2 O 491.27 g/mol g) (1 point) K 3 [Fe III (C 2 O 4 ) 3 ]3H 2 O...
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This note was uploaded on 05/31/2009 for the course CHEM 6BL taught by Professor Berniolles during the Spring '08 term at UCSD.

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