"Freezing Point Depression" Essays and Research Papers

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Freezing Point Depression

COLLIGATIVE PROPERTIES: FREEZING POINT DEPRESSION AND BOILING POINT ELEVATION DAY 1 – 04 FEBRUARY 2015 Colligative Properties Depends on the NUMBER of solute, not on the nature of solute particles Freezing Point Depression Boiling Point Elevation Vapor Pressure Lowering Osmotic Pressure Electrolyte and Nonelectrolytes Electrolytes •Separates in water forming a solution that conducts electric current •IONIC COMPOUNDS Non- electrolytes • does not allow the flow of an electric current • COVALENT...

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Freezing point depression lab

Using Freezing-Point Depression to Find Molecular Weight Abstract: In this lab, the purpose was to use the freezing point depression method to determine the molecular weight of aspirin. This was done by determining the freezing of t-butanol and that of a t-butanol and aspirin solution; then finding the molality of the solution, and moles of aspirin. In the results of the experiment, the molar mass was found to be 192.2 g/mol, which differed from the established value of 180.2 g/mol by 6.7%...

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Freezing Point Depression

taken and put in the osometer. Trial Number | Osmolality (mOsm/kg H2O) | 1 | 204 | 2 | 204 | Average | 204 | Figure 1.1: Calibration curve for used for the identification of the concentration of ethanol present in a sample of wine. 5 data points were taken at 5.117g EtOH/100mL solvent, 7.984g EtOH/100mL solvent, 11.13g EtOH/100mL solvent, 14.01g EtOH/100mL solvent and 18.31g EtOH/100mL solvent. Equation for line: y =22.09x-1.274 Concentration based on curve: Osmolality = 204 mOSm/kgH2O ...

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Molar Mass by Freezing Point Depression

Molar Mass by Freezing Point Depression November 28, 2012 NAME Lab partner- Purpose: To determine the molar mass of an unknown substance by measuring the freezing point depression of a solution of an unknown substance and BHT. Equipment: Test tube, 18*150 millimeters Wire stirrer Weighing dish Timer, seconds Chemicals: 2, 6-Di-tert-butyl-4-methylphenol, BHT, 16 grams Cetyl alcohol, CH3(CH2)14CH2OH, 1 gram Unknown substance...

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Determining Molecule Weight by Freezing Point Depression Method

LECTERUR : EXPERIMENT 4 DETERMINING MOLECULE WEIGHT BY FREEZING POINT DEPRESSION METHOD STUDENT NAME : ID : LAB PARTNERS | | INTRODUCTION According to Anne, n.d, the freezing point of a liquid is decreased by adding to another compound to it. This is known as freezing point depression. The pure solvent will have higher freezing point than the solution. Colligative property of matter can explain more about freezing point depression. Whereas, colligative properties depends on the number...

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Molar Mass by Freezing Point Depression Lab

Nick Boyea Billy Lee 3/9/11 Molar Mass by Freezing Point Depression Overview The purpose of this lab is to measure the freezing point depression of a solution of an unknown substance and BHT to determine the molar mass of the unknown substance. Summary of Lab Procedure If not already completed, crush a small amount of BHT and pack it into a capillary tube. Use a small rubber band to clamp the capillary tube to the thermometer, and fasten the thermometer to a ring stand. Fill a Thiele tube...

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Lab: Molar Mass by Freezing Point Depression

Lab Name: Molar Mass by Freezing Point Depression Researcher: Isabella Cuenco Lab Start Date: November 9, 2012 Lab Completion Date: November 9, 2012 Table of Contents SECTION NAME I. Introduction II. Procedure III. Data IV. Analysis V. Conclusion PAGE NUMBER   I. INTRODUCTION Purpose: The purpose of the lab is to find the molar mass of an unknown substance by measuring the freezing point depression of a solution of the unknown...

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Freezing Point Deperession

Ben Quinones AP Chem Mr. Perry 25 January 2013 Molar Mass by Freezing Point Depression Conclusion: My Lab unsuccessfully found the molar mass of the unknown given to us in the lab. We were tasked with finding the molar mass of an unknown compound using the colligative property of Freezing Point Depression. The way we did this was first finding the temperature at which ice crystals form for just regular BHT. Luckily thanks to our TA we were given temperature probes so we could pinpoint exact...

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Molar Mass Determination by Depression

Chemistry 121 Experiment 19 Molar Mass Determination y Depression of the Freezing Point Introduction: The most commonly used liquid is water. In this experiment we study the equilibria that can exist between pure water and an aqueous solution, and ice, the solid form of water. The heat will transfer from a higher temperature to a lower temperature. In order for water to change states of matter, it takes a certain amount of kinetic energy or heat. The shift from ice to water (solid to a liquid)...

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Colligative Properties

experiments were performed to observe the colligative properties. This includes the freezing point depression, and osmotic pressure. Two ice baths were made, one with pure water, the other with salt water. The lowest temperature was then record for each bath and compared. The salt water had a lower freezing point than the pure water by 2 degrees which supports the hypothesis that solutions have a lower freezing point than pure water. The second property observed was osmosis pressure. This experiment...

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