COPY: Spectrophotometric Analysis: Cobalt Chloride Absorption Spectrum
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COPY: Spectrophotometric Analysis: Cobalt Chloride Absorption Spectrum

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Questions and Answers

What is the main principle behind spectrophotometric analysis?

  • Absorption of electromagnetic radiation
  • Attenuation of electromagnetic radiation (correct)
  • Scattering of electromagnetic radiation
  • Reflection of electromagnetic radiation

    • How is electromagnetic radiation described?

  • By referring to its wavelength or frequency (correct)
  • By its color and shape
  • By its speed and direction
  • By its density and pressure

    • What is the function of a spectrophotometer in measuring absorbance?

  • Generates electromagnetic power for the sample
  • Measures the speed of light passing through the sample
  • Separates light into its component wavelengths and selectively measures the intensity of the light (correct)
  • Analyzes the color of the sample

    • What does transmittance measure?

    <p>Ratio of the electromagnetic power existing in the sample to that incident on the sample</p> Signup and view all the answers

    What is the energy expression for electromagnetic radiation?

    <p>$E=h\nu=hc/\lambda$</p> Signup and view all the answers

    Which unit is commonly used to express the attenuation of electromagnetic radiation?

    <p>Absorbance (A)</p> Signup and view all the answers

    According to Beer Lambert law, what is the absorbance (A) of the sample proportional to?

    <p>The molar concentration of the analyte (M)</p> Signup and view all the answers

    What is used to correct the result obtained as several phenomena besides the absorbance of the analyte contribute to the final reading?

    <p>Blank</p> Signup and view all the answers

    What does the absorption spectrum graph plot to determine the maximum wavelength (λ max)?

    <p>Absorbance (A) versus wavelength (λ)</p> Signup and view all the answers

    What results in a linear relation when a graph of absorbance 'A' versus concentration 'C' is plotted for the standard solution?

    <p>Calibration curve or standard curve</p> Signup and view all the answers

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