Calculate the molality of benzoic acid / TBOH solution and use the measured ATf (the change in freezing points) to calculate the value of Kf for...
View the step-by-step solution to:

Question

TBOH.jpg1.      Calculate the molality of benzoic acid / TBOH

solution and use the measured ΔTf (the change in freezing points) to calculate the value of Kf for TBOH.  


Change in freezing points is 9.1 c

TBOH used is 3.2071g and Benzoic Acid used is 0.4083g


2.      Obtain the freezing point of the unknown compound/ TBOH solution from the plateau of the curves. Use your calculated Kf value above for TBOH and the measured ΔTf of the unknown compound (the change in freezing points) to calculate the molality of the unknown compound/ TBOH solution. Finally calculate the molecular weight of the unknown compound (MW = grams / moles).

Change in freezing points is 12 c

TBOH used is 3.1579g and Unknown used is 0.5092g

TBOH.jpg

1. Calculate the molality of benzoic acid / TBOH solution and use the measured ATf (the
change in freezing points) to calculate the value of Kf for TBOH.
Change in freezing points is 9.1 c
TBOH used is 3.2071g and Benzoic Acid used is 0.4083g
2. Obtain the freezing point of the unknown compound/ TBOH solution from the plateau of
the curves. Use your calculated Kf value above for TBOH and the measured ATf of the
unknown compound (the change in freezing points) to calculate the molality of the
unknown compound/ TBOH solution. Finally calculate the molecular weight of the unknown
compound (MW = grams / moles).
Change in freezing points is 12 c
TBOH used is 3.1579g and Unknown used is 0.5092g

Top Answer

Sign up to view the full answer

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

-

Educational Resources
  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question