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Exploring Analytical Chemistry: Techniques for Qualitative and Quantitative Analysis

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This lecture on Analytical Chemistry (CHE301) delves into the principles and techniques used to identify and quantify substances. Focused on synthesizing new materials, students learn how to analyze a white powder sample to confirm its identity as NaCl while detecting trace iodine admixture. The lecture covers quantitative measurements, including caffeine quantification and various analytical methods such as titrations, gravimetry, and spectroscopy. Emphasis is placed on problem definition, technique choice, sample pre-treatment, and effective result reporting, ensuring a comprehensive understanding of analytical protocols.

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Exploring Analytical Chemistry: Techniques for Qualitative and Quantitative Analysis

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Presentation Transcript

  1. Lecture 1 Analytical Chemistry CHE301

  2. Synthetic Chemistry Analytical Chemistry To find out what is it To make a new stuff “white powder”

  3. Quantitative Qualitative to identify This white powder is NaCl to detect There is a trace admixture of iodine in this sample to analyze to determine X in a sample to quantify to measure 0.375 mg/mL caffeine Run assay determination quantitation Composition, %%: Cu, 85.34(3); Zn, 11.23; Sn, 1.02(2); Fe, 0.123(2); Mn, 0.058(5);Ni, 0.229(5); …

  4. Analytical chemistry sequence @ BSC Titrations with NaOH, EDTA, KMnO4, K2Cr2O7, , I2 Some separations and photometry CHE111-112 Identification of organic compounds; IR, NMR, GC CHE203-204 Analytical Chemistry itself: gravimetry, titrations, electrochemistry and spectrophotometry CHE301 CHE403 Instruments, how they work and how to operate them Biochemistry, Advanced Analytical Chemistry, Analytical Toxilcology, and Inorganic Chemistry - More about analytical methods

  5. Analytical problems and procedures Definition of the problem Chice of technique Sampling Sample pre-treatment Quantitative analysis Reporting the results Review of the original problem Preliminary qualitative tests

  6. An example from Harris: A chocolate story: how much caffeine?

  7. Garbage in, Garbage out!

  8. Calibration

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