Gravimetric Analysis: Types and Processes
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Questions and Answers

What is the main purpose of gravimetric analysis?

  • Determining the volume of a substance
  • Identifying the color of a compound
  • Measuring the concentration of a substance
  • Calculating the mass or concentration of a substance (correct)
  • In gravimetric analysis, the chemical being quantified is known as ____________.

  • Analyte (correct)
  • Solution
  • Molecule
  • Compound
  • What does an analyte represent in an analytical procedure?

  • A substance or chemical constituent of curiosity (correct)
  • A type of laboratory equipment
  • A liquid solvent used for measurements
  • A tool for separating compounds
  • Why are gravimetric analyses considered accurate for determining particulate mass concentration?

    <p>They compare masses of two compounds containing the analyte</p> Signup and view all the answers

    Which step immediately follows the separation of the desired ion/element/radical in gravimetric analysis?

    <p>Formation of a natural insoluble compound</p> Signup and view all the answers

    What is one advantage of gravimetric analysis over other methods of analysis?

    <p>High accuracy in determining mass concentration</p> Signup and view all the answers

    What is the primary technique used in Volatilization Gravimetry?

    <p>Heating the sample</p> Signup and view all the answers

    In Thermogravimetric analysis, what is measured as a function of increasing temperature?

    <p>Changes in physical and chemical properties</p> Signup and view all the answers

    What is the main objective of Precipitation Gravimetry?

    <p>To split one or more parts of a solution by precipitation</p> Signup and view all the answers

    Which gravimetric analysis technique involves chemically decomposing a sample to convert it into a gas for weighing?

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

    How is moisture content determined using Volatilization Gravimetry?

    <p>By heating the sample</p> Signup and view all the answers

    What is a common application of Precipitation Gravimetry in determining anionic species?

    <p>Indirect determination of PO43- by precipitating Hg2Cl2</p> Signup and view all the answers

    What is the main principle behind gravimetric analysis?

    <p>Estimation of mass percent of an ion in an impure compound</p> Signup and view all the answers

    What is the purpose of precipitation gravimetry in gravimetric analysis?

    <p>To convert the analyte into an insoluble form</p> Signup and view all the answers

    Why does gravimetric analysis not require a series of standards for calculation of an unknown?

    <p>Because it is based only on atomic or molecular weights</p> Signup and view all the answers

    What happens to the separated precipitate in gravimetric analysis after being induced?

    <p>It is dried or ignited, possibly to another form</p> Signup and view all the answers

    Which step is common in the process of gravimetric analysis?

    <p>Heating compounds to chemically decompose them</p> Signup and view all the answers

    In gravimetric analysis, what is measured to determine the mass of the pure compound?

    <p>The mass of the separated precipitate</p> Signup and view all the answers

    What is the purpose of using a Buchner’s funnel in gravimetric analysis?

    <p>To filter the solution under vacuum</p> Signup and view all the answers

    Why is it recommended to carry out more than one washing of the beaker in gravimetric analysis?

    <p>To ensure no residue is left on the walls of the beaker</p> Signup and view all the answers

    Which statement describes an advantage of using the gravimetric method in chemical analysis?

    <p>It involves direct measurement without calibration</p> Signup and view all the answers

    What can be done with the gravimetric analysis data after weighing the dried product?

    <p>Determine the mass of the ion formed</p> Signup and view all the answers

    Why is it important to dry the product completely in gravimetric analysis?

    <p>To avoid inaccuracies in weighing</p> Signup and view all the answers

    What are the most expensive items required for gravimetric analysis?

    <p>Platinum crucibles and muffle furnace</p> Signup and view all the answers

    What is the primary goal of electrogravimetry in environmental engineering analysis?

    <p>To quantify ions of a substance by deposition on an electrode</p> Signup and view all the answers

    Which method involves the electrochemical reduction of metal ions at a cathode and simultaneous deposition of the ions on the cathode?

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

    What type of analytes are commonly determined using particulate gravimetry in environmental engineering?

    <p>Suspended solids and oil and grease</p> Signup and view all the answers

    During electrogravimetry, what corresponds to the mass of analyte initially present in the sample?

    <p>The weight difference of the cathode before and after electrolysis</p> Signup and view all the answers

    Which process involves separating matter in environmental samples based on volatility and particle size?

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

    What is an example given in the text that illustrates electrogravimetry?

    <p>Deposition as PbO2 at a Pt anode</p> Signup and view all the answers

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