Exp. 04 – Quantifying the Composition of Limestone

Why are we doing this experiment?

  • Identification of an unknown compound is a critical skill for many chemists regardless of their field.  Whether it be the product of a synthesis in a research lab or identification of  a component of hazardous waste, correctly identifying components as well as the relative amounts of each is of critical importance.
    • Identification of unknowns can be done using many methods, including seeing what the unknowns react with.
  • Technique building.
    • Filtrations are commonly used in a variety of fields to separate substances.

How do I prepare for lab?

What will I do in lab?

  • You will be performing a separation
  • Technique Videos to Watch
    • Gravity Filtration
    • Using an Analytical Balance
  • Safety
  • Common Errors in Lab
    • Disposing of waste improperly
    • Taking the wrong samples from the oven.  Mark your samples carefully and make sure you retrieve only your samples from the oven.
    • Not including the mass of the empty crucible and/or lid when determining mass.

What will I do after lab?

  • Calculations
  • Post-lab Checklist (i.e. things you should be able to do for the lab practical)
    • Complete a gravity filtration and sketch the setup.
    • Determine the percent composition of all species in a compound.
    • Determine the empirical formula of a compound from experimental data.
    • To understand the general formula for hydrated compounds and its definition.

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