Freezing Point Depression Lab Attempts to correctly record and report data
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
View your collected data for the MIXTURE Draw two best fit lines from the two separate portions of the curves.
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.