part 2 of the lecture videos

Questions/comments about the lecture videos or solutions in real life? Submit in discussion forum!

NOTE: Somewhere I've written or mention that you don't need to be able to calculate boiling point/freezing point changes. WRONG! You need to be able to use the T_f = K_{f *}m_p formula to calculate freezing point depression (or boiling point elevation)

Video 3 of 6: vapor pressure

Video 4 of 6: salt in pasta water and boiling point elevation

How to calculate T_f and T_b. Don't worry about anything with P_soln = X_solvx P_solvent

Self-Check:

What is the molality of particles in 0.12 m methanol (CH₃OH) in water? ans 0.12 m, only 1 particle per mol for molecular compounds, m_p is 0.12 m

What is the molality of particles in 0.12 m NaF in water? ans 0.24 m, there are 2 ions (Na+ and F-) per mol of NaF, mp would be 0.24 m

What is the molality of particles in 0.12 m CaF₂ in water? ans 0.36 m, there are 3 ions (Ca2+ and 2xF-) per mol of CaF2, mp would be 0.36 m

What is the T_b for 2.00 m NaF in water? ans