Lab Report Determination of Molar Mass by Freezing Point Depression Experimental

Question

Lab Report Determination of Molar Mass by Freezing Point Depression Experimental Data Unknown ID number Part 1 Freezing Point of Pure PDB 30. Mass of large empty test tube Mass of test tube & PDB Mass of PDB (by difference) Part 2-Freezing Point of PDB-Unknown Mixture 2g) St. Mass of vial & unknown Mass of vial & unknown minus Sample I Mass of unknown added (by difference) Part 3 Point of PDB Unknown Mixture 4 g) Mass of vial & unknown Mass of vial & unknown minus Sample ll Mass of unknown added (by difference) a.07 Total mass of unknown added Page 1 of 4 Determination of Molar Mass by Freezing Point Depresson

Explanation / Answer

1. Literature freezing point of PDB = 53.2 oC

www.clarion.edu

2. Percent error in freezing point of PDB

= (53.2 - 51) x 100/53.2 = 4.13%

3. If the actual molar mass of compound is three times the experimental value, the compound is an electrolyte with Van't Hoff factor = 3 instead of 1 as we have taken in the calculations above.

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