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HSC Chemistry

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  1. Module 5: Equilibrium and Acid Reactions
    5.1 Static and Dynamic Equilibrium
    5 Topics
  2. 5.2 Factors that Affect Equilibrium
    2 Topics
  3. 5.3 Calculating the Equilibrium Constant
    2 Topics
  4. 5.4 Solution Equilibria
  5. Module 6: Acid/Base Reactions
    6.1 Properties of Acids and Bases
    7 Topics
  6. 6.2 Using Brønsted–Lowry Theory
    2 Topics
  7. 6.3 Quantitative Analysis
    1 Topic
  8. Module 7: Organic Chemistry
    7.1 Nomenclature
    2 Topics
  9. 7.2 Hydrocarbons
    2 Topics
  10. 7.3 Products of Reactions Involving Hydrocarbons
  11. 7.4 Alcohols
    1 Topic
  12. 7.5 Reactions of Organic Acids and Bases
  13. 7.6 Polymers
    2 Topics
  14. Module 8: Applying Chemical Ideas
    8.1 Analysis of Inorganic Substances
    3 Topics
  15. 8.2 Analysis of Organic Substances
  16. 8.3 Chemical Synthesis and Design
  17. Working Scientifically
    Working Scientifically Overview
    1 Topic

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HSC Chemistry 8.1 Analysis of Inorganic Substances Gravimetric Analysis
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Lesson 14, Topic 3
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Gravimetric Analysis

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Gravimetric analysis is a quantitative technique in which the amount of analyte, a substance that is to be analysed, is determined through the measurement of mass.

  1. Obtain analyte from environment/solution
    • Precipitation
    • Evaporation (for a single analyte)
    • Distillation
    • Volatisation
  2. Preserve all analyte, ensure purity
  3. Weigh analyte (or its compound)
  4. Calculate for required value

Precipitation Reaction

  1. Dissolution – A known quantity of the sample with the analyte (i.e. unknown ion) is dissolved in water.
  2. Precipitation reaction – The analyte is precipitated from the solution using a suitable reagent in excess.
  3. Filtration of precipitate – The precipitate is collected by filtration then washed, dried and weighed.
  4. Precipitation reaction calculation – The amount of analyte in the sample is calculated from the amount of precipitate.