Lecture1 - Ian J. Ball Lecture 1: Gravimetric Analysis 1...

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Unformatted text preview: Ian J. Ball Lecture 1: Gravimetric Analysis 1 Chemistry 6BL: Chemistry 6BL: Introductory Inorganic Introductory Inorganic Chem Chem . Lab. . Lab. Ian J. Ball, Ph.D. Department of Chemistry & Biochemistry Office: York Hall 4030A Phone: 534-6621 E-mail: iball@ucsd.edu Office Hours: Tu, ~9am & 11-12pm; W, 10:30-12:00; Th, 1:30-3:00 pm Quantitative Analysis: Quantitative relationship between reactants and products. Quantitative Analysis can cover: Stoichiometry % Composition Limiting Reagents % Yield Quantitative Analysis Quantitative Analysis Gravimetric Analysis Gravimetric Analysis Quantitative Analysis: Gravimetry Gravimetry is the measurement of weight or density Gravimetry is used to determine amounts of substances Gravimetry is generally not used to identify unknowns Ian J. Ball Lecture 1: Gravimetric Analysis 2 Gravimetric Analysis Methods Gravimetric Analysis Methods Two primary ways of gravimetric analysis Combustion - collect the resulting residues (see pg. F90 ff in textbook) Precipitation - one component is crashed out of solution (Chap. 11.8 ff ) Experiment #1 involves precipitation Use this to back-calculate concentration of [Al 3+ ] from mass of Aluminum Oxinate (Alq 3 ) Quantity Quantity vs vs . Concentration . Concentration Chemsitry 6A redux: Quantity is absolute - e.g. moles, grams Things like concentration are relative - e.g. mol/L Experiment #1 involves: mass of Alq 3 precip. moles of precip. moles of Al 3+ react. concentration Combustion Example Combustion Example Example: Methanol is burned in air to produce 1.23 g of CO 2 . What was the original mass of methanol (CH 3 OH)? Wait?! What do I do now?!! Ian J. Ball Lecture 1: Gravimetric Analysis 3 Stoichiometry Stoichiometry : Reaction Equation : Reaction Equation Before you do anything in Chemistry BALANCE THE REACTION EQUATION! If you dont, you won t accurately determine: The Limiting Reagent % Yield Concentration Etc.!...
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This note was uploaded on 12/26/2009 for the course CHEM CHEM 6BL taught by Professor Berniolles during the Spring '08 term at UCSD.

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Lecture1 - Ian J. Ball Lecture 1: Gravimetric Analysis 1...

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