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College Analytical Methods Questions

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College Analytical Methods
College Analytical Methods
Which of the following represents the mobile phase utilized in paper chromatography?
  1. filter paper
  2. the developing solution
  3. the ink samples
  4. silica gel backing
College Analytical Methods
Which of the following statements correctly describes the importance of the dissolved analyte in gravimetric analyses, with regards to its reaction with the solution?
  1. It forms a soluble product
  2. Its reaction with the solution forms an insoluble product, which can be used to determine the identity of an unknown species
  3. It increases the solubility of the solution
  4. Reacting with the solution decreases the solubility of the overall system
College Analytical Methods
Which of the following sources of error could account for a higher mass of product than is expected?
  1. The precipitate was completed dried, with some loss of product
  2. Most of the supposed product is dissolved in aqueous solution
  3. The precipitate was not completely dried
  4. None of the above
College Analytical Methods
Which of the following equations correctly represents the equation for the retention factor?
  1. [math]R_f = "distance of solvent"/"distance of substance"[/math]
  2. [math]R_f="distance of substance"/"distance of solution"[/math]
  3. [math]R_f="distance of substance"/"distance of solvent front"[/math]
  4. None of the above
College Analytical Methods
Which of the following is a replaceable ion for the cation exchanger?
  1. Hydrogen ion
  2. Chloride ion
  3. Hydroxice ion
  4. Nitrate ion
College Analytical Methods
What is the size of nucleation clusters?
  1. [math]10^(-10) [/math] to [math]10^(-9) [/math] m
  2. [math]10^(-11)[/math] to [math]10^(-8) [/math] m
  3. [math]10^(-6) [/math] to [math]10^(-3)[/math] m
  4. [math]10^(-12) [/math] to [math]10^(-13)[/math] m
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