Freezing Point Depression of t-Butanol Colligative
Madison Howell (Arthi Arnesh)
Thursday February 16, 2017
The objective of this experiment was to determine the molar mass of an
unknown solute by measuring the freezing point depression of a so
Pyrethroid and organophosphorus
pesticides in composite diet samples
from atlanta,usa Adults
Aarthi ramesh and madison howell
To measure pyrethroid and organophosphorus pesticide
levels in 24hr duplicate diet samples collected from 12
Experiment # and Page
NOTE: OLD-TIMERS will have a written assignment but
no lab meeting (will be emailed to you).
STUDENTS need to come for safety orientation and
Megans Oven Lab (no preparation to do).
1. Chromatography enables us to separate compounds in a mixture from each other
and have the separated components show up one at a time in a systems detector.
We can identify the compounds and measure how much i
The solution freezes at a lower temperature ( Tf) than the pure solvent. Decrease in freezing point ( Tf) is directly proportional to molality (Kf is the molal freezing-point-
Useful Equations and Data PV = nRT R = 0.0821 L atm mol-1 K-1 1 atm = 760 torr = 101, 325 Pa = 14.70 lbs in-2 Cg = kPg X = (moles of component)/(total moles of all components) mass % = (mass of component)/(total mass of all components) *100% ppm = (m