Freezing Point Depression Lab - PowerPoint PPT Presentation

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Freezing Point Depression Lab

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  1. Freezing Point Depression Lab Attempts to correctly record and report data

  2. Remember Colligative Properties Tf = iKfm molality = moles of solute (unknown) kg of solvent (nonpolar solvent) Solvent = 2,6-ditertbutyl-4-methylphenol Mixture = Solvent + Unknown Compound Possible Unknowns Stearic Acid para-Dicholorobenzene Naphthalene

  3. View your collected data for SOLVENT

  4. Compare your experimental to the actual reported on the board

  5. View your collected data for the MIXTURE

  6. View your collected data for the MIXTURE Draw two best fit lines from the two separate portions of the curves.

  7. View your collected data for the MIXTURE

  8. Using the data! Tf=Kfm molality = moles of solute (unknown) kg of solvent (nonpolar solvent) • Calculate Tf - Plug in. • Use the accepted Kf • Solve for m of the solution mixture. • Use m to solve for moles of unknown solute. • Use moles to calculate molar mass. • ID the unknown.