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Chapter 13 & 14

Chapter 13 & 14. CHM 411 Spring 2013 Suroviec. I. UV-Vis molecular absorption. I. Beers Law. Deviations and limitations to Beers Law:. Example.

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Chapter 13 & 14

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  1. Chapter 13 & 14 CHM 411 Spring 2013 Suroviec

  2. I. UV-Vis molecular absorption

  3. I. Beers Law Deviations and limitations to Beers Law:

  4. Example • A solution containing 5.24 mg/100 mL of A (MW 335 g/mol) has a transmittance of 55.2% in a 1.50 cm cell at 425 nm. Calculate the molar absorptivity of A at this wavelength.

  5. Example • A simultaneous determination for cobalt and nickel gives the following information: • Calculate the molar concentration of nickel and cobalt.

  6. II. Types of Instruments 1. Single Beam 2. Multichannel

  7. III. Applications • Absorbing species Absorption of UV-VIS radiation is excitation of bonding electrons • Electronic transitions: p, s and nonbonding

  8. B. Types of transitions

  9. B. Types of transitions

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