Lab 7

1. Freezing point of HAc= Tf

15.8 ⁰C

2. Mass of acetic acid in kg

0.03147 kg

3. Volume of unknown in solution # 1

1.50 ml

4. Mass of unknown in solution # 1

1.1865 g

5. Freezing point of solution # 1= Tf1

-3.5⁰C

6. ∆Tf= Tf-Tf1

7. Molality of solution # 1=m

8. Number of moles of unknown in solution # 1=n1

9. Molar mass of the unknown

10. Volume of unknown solution # 2

3.0 ml

11. Mass of unknown solution # 2

2.373 g

12. Freezing point of solution #2= Tf2

-6.5⁰C

13. ∆Tf=Tf-Tf2

14. Molality of solution # 2

15. Number of moles of unknown in solution # 2=n2

16. Molecular mass of the unknown

17. Average mass of the unknown

∆Tf

8.37⁰C

m

0.5 m

Kf

1.86 ⁰C.Kg/mol

i