lab 2 freezing point depression.pdf

Δ t f 114 c 83 c 31 c molality moles of unknown

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Δ T f = 11.4 °C - 8.3 °C = 3.1 °C molality = moles of unknown solute: molecular weight of unknown: 4. Let’s suppose that after graphing your freezing point depression curves you pick a freezing point for the unknown that is too low. How would this specifically affect the calculated molecular weight of your unknown? If the chosen freezing point was too low then Δ T f would be too small which would then affect the calculations for the molality and amount of moles of the unknown, causing them to be smaller as well. Ultimately the calculated weight of the unknown would be too large due to the smaller amount of calculated moles of unknown solute. Checklist of Items to Submit before your next lab meeting _______ Hard copy of lab report printed, academic integrity code signed, stapled and ready to hand in before the start of pre-lab (if required by your instructor) _______ Electronic copy with academic integrity code submitted on AsULearn before the start of pre-lab under “Freezing Point Depression Report Submission” _______ Note: Results table #3 has a blank for the MW of your unknown compound, this unknown information does not carry the same weight as the other unknowns (marked by U1, U2, etc) in this course. It is a smaller portion of your lab report grade.
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