Lecture 2 Volumetric Analysis

Lecture 2 Volumetric Analysis - CHEM 6BL Experiment 2:...

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Unformatted text preview: CHEM 6BL Experiment 2: Volumetric Analysis of An Organic Acid Instructor: Dr. S. Berniolles Page 1 1 Chemistry 6BL Lab/Course Schedule Chemistry 6BL Lab/Course Schedule Week of Lecture & Exam Schedule Lab Period Lab Schedule Prelab & Report Due Dates Apr. 6 Organic Acid Analysis (Expt. 2) 1st lab 2nd lab Safety Exam/ Expt. 1 (filtration/drying)/ Expt. 2 prep work End Expt.1/ Expt. 2 (Parts I- II) Prelab Expt. 1 Prelab Expt. 2 2 Safety Exam Schedule Reminders Safety Exam Schedule Reminders c If you failed or missed the safety exam: make- up on Thursday, Apr. 9, 7 am in York 2622 (Safety Contact: Sheila Kennedy 858-534-0221) c There will be NO MAKE-UP OF THE MAKE-UP!!!!! NO EXCEPTIONS!!!!!!! c Review session on Wed., Apr. 8, Natural science Building 3209, 5-5:50 PM (B00) & 6-6:50 PM (A00) 3 Lab Report Format Lab Report Format c Abstract c Introduction c Experimental ( Prelab Procedure) c Results (Data, Obs., Calcs. Raw Data) c Discussion See Lab Manual- Gen. Info- P. 18-19 + Lab Report/Excel Guides posted on WebCT CHEM 6BL Experiment 2: Volumetric Analysis of An Organic Acid Instructor: Dr. S. Berniolles Page 2 4 Analytical Chemistry Analytical Chemistry Fundamental branch of chemistry that involves either:- Identifying the components that make up a compound (qualitative analysis)- Determining the specific amount of a compound (quantitative analysis) 5 Experiment 2: Volumetric Analysis Experiment 2: Volumetric Analysis c Known volumes of known concentrations reacted with known volumes of unknowns From reaction equation, relate to moles c Common analytical technique: Titration (use of a buret) c Experiment #2 uses Volumetric Analysis 6 Volumetric Analysis: Titration Volumetric Analysis: Titration c Titration with a Buret Titrant : known concentration of reactant - Volume delivered measured in buret Analyte : known volume of unknown - Need to determine concentration c Need indicator for acid-base titrations Starting Volume Ending Volume Titrant Analyte CHEM 6BL Experiment 2: Volumetric Analysis of An Organic Acid Instructor: Dr. S. Berniolles Page 3 7 Volumetric Analysis: Titration Volumetric Analysis: Titration c Titrations Acid-Base titrations ( Expt #2 ) Redox titrations ( Expt #4B ) c Looking for the stoichiometric point : When stoichiometric amounts of the titrant and the analyte have reacted Also known as equivalence point c Not endpoint = indicator color change 8 Volumetric Analysis: Titration Volumetric Analysis: Titration c Titration with a Buret: DONT FORGET TO RECORD INITIAL VALUE of titrant before titrating V delivered = ending V starting V c Your TA can show you how to hold valve...
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Lecture 2 Volumetric Analysis - CHEM 6BL Experiment 2:...

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