Experimental Data Unknown ID number Part 1-Freezing Point of Pure PDB 30 Mass of

ID: 1066313 • Letter: E

Question

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 2 g) St. Iga Mass of vial & unknown Mass of vial & un minus Sample I known 1.915 Mass of unknown added (by difference) Part 3-Freezing Point of PDB-Unknown Mixture 4 g) Mass of vial & unknown Mass of vial & un minus Sample ll known Mass of unknown added (by difference) 2.07 Total mass of unknown added Determination of Molar Mass by Freezing Point Depression Page

Explanation / Answer

Freezing point depression

dTf = -iKf.m

i = 1

-Kf = -7.10 oC/m

molarity (m) = moles/kg of solvent

moles = grams/molar mass

Table

Solution 1 Solution 2

1. Mass of PDB (kg) 0.026574

2. mass of unknown (g) 1.99 2.07

3. freezing point of pure PDB (oC) 51

4. Freezing point of solution (oC) 47 44

5. dTf (oC) 4 7

6. Molality of solution (m) 0.563 0.986

7. moles of unknown (mol) 0.015 0.026

8. molar mass of unknown (g/mol) 132.667 79.615

average molar mass of unknown = 106.141 g/mol

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Experimental Data (3 pts. for blanks in experimental section) Mass of copper(II)

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Experimental Data Unknown ID number Part 1-Freezing Point of Pure PDB 30 Mass of

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