Analytical Chemistry II: Colorimetry Theory
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Questions and Answers

What is the origin of color in inorganic materials?

  • F-F transition
  • d-d transition (correct)
  • Defect in crystal of solid lattice
  • Chemical reaction
  • What type of solutions absorb some wavelengths and emit others?

  • Inorganic solutions
  • Transparent solutions
  • Colored solutions (correct)
  • Dark solutions
  • What type of materials have functional groups with unsaturated linkage that cause color?

  • Organic materials (correct)
  • Colored solutions
  • Inorganic materials
  • Transparent solutions
  • According to the basic law of colorimetry, which portions of light can be neglected?

    <p>Reflected and scattered</p> Signup and view all the answers

    What is the relation between the concentration of a solution and the intensity of incident light in colorimetry?

    <p>Direct relation</p> Signup and view all the answers

    What is the main characteristic of dark solutions?

    <p>Absorbs light completely</p> Signup and view all the answers

    What is the relationship between transmittance (T) and absorbance (A) of a solution?

    <p>A = -log T</p> Signup and view all the answers

    What does the Beer-Lambert law tell us about the absorption of light by a solution?

    <p>The absorption is directly proportional to the concentration and path length</p> Signup and view all the answers

    How does the concentration of absorbing molecules affect the absorbance of light according to Beer's law?

    <p>The absorbance increases with increasing concentration</p> Signup and view all the answers

    What is the unit of molar absorptivity (Ԑ) for a substance?

    <p>L/mol/cm^2</p> Signup and view all the answers

    What is a characteristic of molar absorptivity (Ԑ) at an absorption maximum for a species?

    <p>It varies with the wavelength of incident light</p> Signup and view all the answers

    What is the effect of increasing path length on the absorbance of light in a solution?

    <p>The absorbance increases with increasing path length</p> Signup and view all the answers

    How does the molar absorptivity (Ԑ) affect the sensitivity of a colormetric method?

    <p>As Ԑ increases, sensitivity increases</p> Signup and view all the answers

    What does 'concentration' refer to in the context of absorption of light?

    <p>The amount of solute per unit volume of solution</p> Signup and view all the answers

    What is the relationship between absorbance (A) and concentration (c) according to Beer's law?

    <p>$A = \varepsilon cL$</p> Signup and view all the answers

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