UsingFreezing-PointDepression to FindMolecularWeightFormalLabReport
The purpose of this lab is to be able to use the freezingpoint of a substance to find the molecularweight of it. To do this, we will use the Logger Pro program to obtain the freezingpoint of lauric acid and...
freezingpoint of pure naphthalene using your thermometer.
2. Determine the molecularweight of sulfur using the freezingpointdepression data. Report a percent error. From the molal concentration of your solution, calculate the quantity of solute which would be present in 1000 g of naphthalene.
Colligative Properties & Osmotic Pressure
Peter Jeschofnig, Ph.D. Version 42-0149-00-01
This document is not meant to be a substitute for a formal laboratory report. The LabReport...
UsingFreezing-PointDepression to FindMolecularWeight
In this lab, the purpose was to use the freezingpointdepression method to determine the molecularweight of aspirin. This was done by determining the freezing of t-butanol and that of a t-butanol and aspirin solution; then...
boiling pointdepression, using molality. The equation for temperature depression or expansion is
ΔT= Kf × m
ΔT is temperature depression (for freezingpoint) or temperature expansion (for boiling point) (°C)
Kf is the freezingpoint constant (kg °C/mol)
m is molality in mol/kg...
scientific facts that state that salt solutions will have a lower freezingpointdepression than sugar solutions because NaCl contain fewer particles compared to Sucrose. This can be proven because the molecularweight of NaCl is 58.44 grams per mole compared to 342.3 grams per mole of Sucrose. NaCl nearly...
-electrolytes 6. solve problems involving freezingpointdepression, boiling point elevation, vapor pressure lowering, and increase in osmotic pressure 7. use Raoult’s Law to relate vapor pressure lowering to solute mole fraction 8. explain different properties of colloidal systems such as size of particles...
BASIC CHEMISTRY (UDBB 1114)
BACHELOR OF SCIENCE (BIOTECHNOLOGY)
SESSION : MAY 2013
DATE : 25 JUNE 2013
DETERMINING MOLECULE WEIGHT BY FREEZINGPOINTDEPRESSION METHOD
STUDENT NAME :
LAB PARTNERS |
According to Anne, n.d, the freezing...
Colligative Properties Lab Blk: Date:
FreezingPointDepression of Acetic Acid – Acetamide Solution Lab#________
How does antifreeze lower the freezingpoint of water in the cooling systems of automobiles? In the late nineteenth century the...
monitor the temperature regularly throughout your experiment.
• For a related, more advanced experiment on freezingpointdepression, see the Science Buddies project Chemistry of Ice-Cream Making: Lowering the FreezingPoint of Water
• Do you think salt would melt ice in your freezer? Why or why not? Try it and find out....
Colligative Properties Lab
Demonstration of Selected Calculations from Choice I
Determination of Kf for Naphthalene
To determine the Kf for naphthalene, we need to find the difference in the freezingpoint of pure naphthalene and the solution of 1,4-dichlorobenzene in naphthalene...
present, not the identity of those solute particles. These properties include: vapor pressure lowering, boiling point elevation, freezingpointdepression, and osmotic pressure” (p. 17 lab manual). In this experiment freezingpointdepression is illustrated by comparing the freezingpoint of distilled...
the temperature from time to time. Notice the increase in the normal boiling point of 100oC.
Based on the observed temperature changes, compute the weight of the salt added to the solution to cause the freezingpointdepression and boiling point elevation. Compare with the actual value....
weight is calculated as
The boiling point of a solution was used to determine that santonic acid has a molecular mass of approximately 246. You can also find this value by using the freezingpoint of the solution.
In the two previous examples, the sucrose and santonic acid existed in solution as...
Intermolecular Forces Worksheet Answers 1) Using your knowledge of molecular structure, identify the main intermolecular force in the following compounds. You may find it useful to draw Lewis structures to find your answer. a) b) c) 2) PF3 H2CO HF dipole-dipole force dipole-dipole force...
factor by using Equation 2. This originated from the freezingpointdepression equation:
i = ΔT/((Kf)(m)) (Equation 2)
The freezingpoint constant (Kf) of water is 1.86 °C m-1. Each mass amount and Van’t Hoff factor was calculated then analyzed in a table.
. Online lab manual. Winter 2012. Experiment #6
2. Atkins, Peter, De Paula, Julio, Physical Chemistry, W. H. Freeman and Company, New York (2010)
In experiment #6 “FreezingPointDepression”, the effects on the freezingpoint of dissolving a solute in a solvent was explored from a...
-polyacrylamide gel electrophoresis (SDS-PAGE) to determine molecularweight and purity of the recovered proteins 15 Protein characterization by fluorescence spectroscopy 16 Final formal research labreport in the style of Biochemistry 84-89 90-96 97-98 69-73 74-83
Appendices: pET-15b vector, Rubric for final...
Laboratory Techniques and Measurements
Peter Jeschofnig, Ph.D. Version 42-0165-00-01
This document is not meant to be a substitute for a formal laboratory report. The LabReport Assistant...