STK1863 Analytical Chemistry LU3: Gravimetric Analysis
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Questions and Answers

What is the main signal used in precipitation gravimetry?

  • The mass of a particulate analyte
  • The mass of the analyte
  • The loss of a volatile species
  • The mass of a precipitate (correct)
  • Which type of gravimetric analysis involves determining the mass of a particulate analyte following its separation from its matrix?

  • Precipitation gravimetry
  • Volatilization gravimetry
  • Particulate gravimetry (correct)
  • None of the above
  • What is the reaction format for a pure, insoluble precipitate in gravimetric analysis?

  • Aa + rR -----> AaRr
  • Aa + rR -----> AaRrpptppt
  • Aa + rR -----> AaRrppt (correct)
  • Aa + rR -----> A + R
  • Which method of gravimetric analysis involves the loss of a volatile species as the signal?

    <p>Volatilization gravimetry</p> Signup and view all the answers

    What type of analysis is based on the measurement of the mass of an analyte or a compound containing the analyte?

    <p>Gravimetric analysis</p> Signup and view all the answers

    Which type of analysis involves the determination of mass through the measurement of a precipitate?

    <p>Gravimetric analysis</p> Signup and view all the answers

    Which step of precipitation involves the addition of a precipitating agent solution to the sample solution?

    <p>Step 2: Precipitation</p> Signup and view all the answers

    What is an important condition for a precipitate before conducting precipitation?

    <p>It should consist of large crystals that can be easily filtered</p> Signup and view all the answers

    Which type of reagent precipitates only with a single chemical species?

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

    What is the term used for the process where a small number of particles in a solution come together randomly and form small aggregates?

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

    Under what circumstances can a pre...?

    <p>Supersaturated Solution</p> Signup and view all the answers

    What occurs when precipitation require by adding precipitating agent occurs in series (step by step)?

    <p>Nucleation &amp; Particle Growth</p> Signup and view all the answers

    Which phase contains more of the dissolved salt than occurs at equilibrium?

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

    What is described as a saturated solution?

    <p>Solution containing exactly the equilibrium limits for solubility</p> Signup and view all the answers

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