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Understanding Electrode Measurements in Analytical Chemistry

Exploring applications of potentiometric titrations, pH electrodes, and ion-selective electrodes for quantitative measurements. Learn how these electrodes work and their specific roles in different titration categories. Discover the significance of endpoint numerical calculations and find out about detection limits and interferences.

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Understanding Electrode Measurements in Analytical Chemistry

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  1. Electrode Measurements – Ch 15 Applications to potentiometric titrations, pH electrodes, quantitative measurements using ion-selective electrodes, etc. There are electrodes available for each of the 4 titration categories covered in this class: • Acid-base – pH electrodes • Precipitation – Ag/AgCl electrode, Ag+ specific ion electrode • Complexiometric – Ca2+ specific ion electrode • Redox – Pt electrode, Saturated Calomel Electrode (SCE)

  2. Potentiometric Titrations (Sec. 10-4) Finding the Endpoint Numerically 1st der. = 2nd der. =

  3. How Ion-Selective Electrodes Work (Sec. 15-3 – 15-5) Ideally responds to only the analyte ion in a solution. Produce a voltage because of a charge difference that develops inside and outside of the electrode. A. Liquid-Based Ion-Selective Electrodes

  4. Ca2+ Ion-Selective Electrode

  5. Valinomycin is used in K-electrodes

  6. Valinomycin

  7. pH Measurement with a Glass Electrode

  8. Acid and Alkaline Errors of pH Electrodes

  9. B. Solid-State Ion-Selective Electrodes

  10. Electric Potential Difference for an Ion-Selective Electrode e.g. pH electrode

  11. Detection Limits and Interferences Pb limit of detection =

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