gravimetry analysis

Define digestion.

Define supersaturation.

Explain the differences between a colloidal and crystalline precipitate.

Explain the differences between occlusion and mixed-crystal formation.

Define peptization and how is it avoided.

List the step involved in typical gravimetric analysis procedure.

What is the main principle behind gravimetric analysis.

• Measurement of light absorption by a compound

• Titration of an unknown solution
  

• Conversion of an analyte into an insoluble compound that can be weighed

• Measurement of electrical conductivity

Why is it important to add the precipitating reagent slowly and with constant stirring?

• To reduce the solubility of the product

• To ensure complete and pure precipitation

• To increase the temperature of the reaction

• To avoid formation of large crystals

What is the purpose of "igniting to constant weight" in gravimetric analysis?

• To remove the excess precipitating reagent

• To ensure water is retained in the sample

• To decompose the precipitate into a volatile form

• To make sure all moisture is removed for accurate weighing

In the determination of sulfate by precipitation with barium chloride, the precipitate formed is:

• BaSO₄

• Ba(NO₃)₂

• BaCO₃

• Ba(OH)₂