4BC - CHEM 6BL Experiments 4B-C: Iron Oxalate Complex...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
CHEM 6BL Experiments 4B-C: Iron Oxalate Complex Analysis Instructor: Dr. S. Berniolles Page 1 Week Week 6 6 Schedule of Activities Schedule of Activities Lecture & Exam Schedule Lab Period Lab Schedule Assignment Due Dates/ Quiz Dates 1 st Lab End Expt. 4A / Start Expt. 2 Exam 1 on Feb. 10 2 nd Lab Expt. 4B End Expt. 4B, Start Expt. 4C Report/Quiz 4B Quiz 4C 1 • Experiment 3 lab report due on Feb. 17-18 (3 bonus pts if turned in early) CHEM 6BL EXAM 1 EXAM #1 IN LECTURE: Wed, Feb. 10 EXAM #2 (Final) IN LECTURE: Wed, Mar. 10 No Final on Final Exam Week 2 No Final on Final Exam Week! Typically 15 Multiple-choice questions Exam 1 Based on Experiments # 0-4A Lecture Topics Lab Manual Procedures Pre-/Post-Lab Questions Calculations in Lab Experiment 4A Synthesis Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O Fe 2+ 2 NH + 2 2 SO 4 2- = 4- 3 K w [Fe x (C 2 O 4 ) y ]·zH 2 O 2 4 = 2+ K + Fe 3+ C 2 O 4 2-
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CHEM 6BL Experiments 4B-C: Iron Oxalate Complex Analysis Instructor: Dr. S. Berniolles Page 2 Inorganic Complex Synthesis Product 4 Inorganic Complex Analysis Complex product now analyzed for stoichiometry Analysis of K w [Fe x (C 2 O 4 ) y ]·zH 2 O 5 First step: Determine amount of C 2 O 4 2- (y) Second step:Determine amount of Fe 3+ (x) Third step: Use ratio of Fe 3+ : C 2 O 4 2- to determine amount of K + (w) Fourth step: Use (K+Fe+C 2 O 4 ) to get H 2 O (z) Experiment 4B: C 2 O 4 2- Analysis First step: Determine amount of C 2 O 4 2- Need to react C 2 O 4 2- with a known (stoichiometric) amount of a “known” 6 Experiment 4B uses titration w/ a buret Titrations Redox titrations ( Experiment #4B ) Acid-Base titrations ( Experiment #2 )
Background image of page 2
CHEM 6BL Experiments 4B-C: Iron Oxalate Complex Analysis Instructor: Dr. S. Berniolles Page 3 Redox Titration in Experiment 4B Titrant : Known concentration oxidizing agent KMnO 4 Analyte : Known mass Starting Volume Ending 7 : Known mass of unknown Fe-oxalate complex to determine C 2 O 4 2- Indicator : KMnO 4 acts as its own indicator Volume Titrant Analyte Redox Titration in Experiment 4B Mn VII O 4 + C III 2 O 4 2- purple 8 Mn VII O 4 + C IV O 2 + e Mn 2+ + CO 2 clear Redox Titration in Experiment 4B Balance reaction equation: count e- Mn 7+ Mn 2+ 9 Needs 5 electrons [(C 3+ ) 2 O 4 ] 2- 2 (C 4+ )O 2 Yields 2 electrons Need least common multiple of 2 and 5
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CHEM 6BL Experiments 4B-C: Iron Oxalate Complex Analysis Instructor: Dr. S. Berniolles Page 4 Redox Titration in Experiment 4B Balance reaction equation: Need least common multiple of 2 and 5 10 2 Mn 7+ + 10 e 2 Mn 2+ Needs 10 electrons 5 [(C 3+ ) 2 O 4 ] 2- 10 (C 4+ )O 2 + 10 e Yields 10 electrons Redox Titration in Experiment 4B Redox reaction involves two half- reactions: 5 C 2 O 4 2- 10 CO 2 + 10 e (ox) 11 2 Mn 7+ + 10 e 2 Mn 2+ (red) 2 Mn 7+ + 5 C 2 O 4 2- 2 Mn 2+ + 10 CO 2 Electrons cancel leaving full equation Example: Weight % by Redox Titration A 0.0874 g sample containing Br is titrated with 35.56 mL of 0.0148 M KMnO 4 to form BrO 3 &MnO 2 in basic aqueous solution.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/10/2010 for the course CHEM 6A chem 6a taught by Professor Cz during the Spring '10 term at UCSD.

Page1 / 15

4BC - CHEM 6BL Experiments 4B-C: Iron Oxalate Complex...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online